Cellesim
Sarah Jenkins

Sarah Jenkins

Tech Performance Editor & Speed Analyst · Cellesim

Speed & Latency TestingVerizon/AT&T vs. eSIMDigital Nomad TechContent Creator ConnectivitySilicon Valley Tech

Reporting from the tech hub of San Francisco, Sarah Jenkins is the Performance Editor for Cellesim. A true data nerd, Sarah focuses on speed and latency. She conducts head-to-head field tests comparing Verizon and AT&T’s 'International Day Pass' speeds against Cellesim’s eSIM networks. Her reviews are essential for digital nomads and content creators who demand lag-free upload speeds while traveling in Asia and Europe.

Related reading(24)

A quiet, sun-dappled street in Seville, Spain, during Semana Santa, with a glimpse of traditional wrought-iron balconies and intricate tile work.Travel Tips

Semana Santa 2026: Essential eSIM Planning for Your Family Trip

Semana Santa 2026 offers a vibrant, immersive travel experience, especially for families. Ensuring your devices, and more importantly, your kids' iPads and Switches, stay connected without breaking the bank is crucial. An eSIM provides a flexible, cost-effective solution for seamless data across your entire family's devices, letting you manage everything from navigation to essential screen time.

Sarah Jenkins
A traveler in a bustling Bangkok street market checks her phone, illuminated by the warm glow of street food stalls and neon signs at dusk.Travel Tips

eSIM SMS Abroad: Can You Text with a Travel eSIM?

When you're traveling, knowing if your travel eSIM supports SMS is critical, especially for things like two-factor authentication or confirming a booking. The short answer: usually not for traditional SMS, but there are crucial workarounds.

Sarah Jenkins
A woman confidently holds her smartphone, displaying a data signal, as she navigates the bustling Plaka district of Athens, with the ancient Acropolis visible in the background.Travel Tips

Cosmote eSIM in Greece: Skipping Tourist Traps & Staying Connected (2026)

Landing at Athens International? Don't get stuck searching for Wi-Fi. A Cosmote eSIM can get you online before you even clear customs, saving you the hassle of physical SIM cards and inflated tourist prices. Here's how to ensure you're connected from the moment you step off the plane.

Sarah Jenkins
A traveler checks their phone for signal strength near a traditional Balinese temple, with lush green foliage in the background.Travel Tips

Telkomsel eSIM 2026: The Engineer's Guide to Indonesian Data

Telkomsel eSIMs offer robust connectivity across Indonesia, particularly strong in urban centers and popular tourist areas with access to 4G LTE B3/B8 and 5G n40/n78. However, travelers should note that while Telkomsel officially supports eSIM for local citizens, direct tourist eSIM purchase can be challenging. An international travel eSIM from Cellesim often provides a more straightforward setup.

Sarah Jenkins
A family, two parents and two children aged around 8 and 10, are sitting in a bustling international airport lounge, engaged with their devices. The mother is showing something on her phone to her daughter, who has an iPad open on her lap playing a cartoon, while the father is helping his son with a Nintendo Switch. Luggage is neatly stacked nearby.

Nomad eSIM vs. Cellesim: Which Is Best for Family Travel in 2026?

Choosing the right eSIM for family travel can feel like navigating a theme park without a map. Between keeping the kids entertained with streaming data and ensuring you're always connected, the stakes are high. Today, we're diving deep into Nomad eSIM and Cellesim, evaluating their family-friendliness, data options, and those all-important parental control features.

Sarah Jenkins
A family, including two parents and two children aged around 8 and 10, walking through a vibrant street market in New Orleans, Louisiana, during late afternoon.

USA eSIM: Your Family's Guide to Seamless American Adventures 2026

Navigating the USA with kids means managing devices, screen time, and data. This guide helps you pick the perfect USA eSIM, ensuring everyone from toddlers to teens stays connected without breaking the bank. From Disney+ streaming to offline maps, we cover it all.

Sarah Jenkins
A woman confidently navigating her smartphone for data in front of the Colosseum in Rome, Italy, bathed in warm afternoon sunlight.Destination Guides

TIM eSIM Italy 2026: Navigating Local Connectivity with a Telecom Engineer's Eye

Planning your Italian adventure in 2026? Don't let connectivity become a bottleneck. This guide cuts through the noise, offering an engineer's perspective on TIM eSIMs, ensuring you stay connected efficiently and affordably, from the canals of Venice to the Roman Forum.

Sarah Jenkins
Middle East eSIM 2026: Seamless Multi-Country Data for Your JourneyDestination Guides

Middle East eSIM 2026: Seamless Multi-Country Data for Your Journey

Navigating the diverse landscapes and vibrant cities of the Middle East requires robust connectivity. This post cuts through the noise, offering an engineer's perspective on the best eSIM options for multi-country trips in 2026, focusing on network performance, regional coverage, and real-world user experience.

Sarah Jenkins
Timor-Leste: 15 Essential Facts Before Your Visit in 2026Destination Guides

Timor-Leste: 15 Essential Facts Before Your Visit in 2026

Timor-Leste, often overlooked, holds a unique charm and complex history. From navigating local customs to securing reliable internet, this guide shares 15 essential facts gleaned from years on the road, ensuring your trip is smooth and genuinely informed.

Sarah Jenkins
AT&T eSIM for Global Travel: How to Activate and Save on Roaming in 2026eSIM 101 / Tech Hub

AT&T eSIM for Global Travel: How to Activate and Save on Roaming in 2026

For AT&T customers venturing beyond the familiar, the prospect of international roaming charges can be daunting. But a simple, digital solution exists: the eSIM. This little chip-free marvel transforms how you connect, offering significant savings and seamless data access without the hassle of swapping physical SIM cards.

Sarah Jenkins
A woman sits in a sunlit co-working space in Lisbon, Portugal, looking at her laptop with a smartphone next to her, a cup of coffee on the table.How-to & Guides

256kbps eSIM Speed: Is It Truly Enough for Your Travel Data Needs in 2026?

You've seen the budget eSIM plans promising 256kbps speeds. For the long-term nomad, every dollar counts, but so does reliable connectivity. Is this tier a savvy save or a frustrating bottleneck? Let's break down what 256kbps actually feels like on the ground, from checking emails in a bustling Bangkok co-working space to navigating unfamiliar streets in Lisbon.

Sarah Jenkins
A woman holding a new iPhone 18, looking out over the bustling Shibuya Crossing in Tokyo at sunset, checking her device settings.eSIM 101 / Tech Hub

iPhone 18 & Galaxy Z Fold/Flip 6: Optimizing Your New Device's eSIM for International Travel 2026

Just unboxed the latest iPhone 18 or a new Galaxy Z Fold 6? Before your next international trip, ensure your cutting-edge device is configured for seamless global connectivity. We dive deep into optimizing eSIM performance, avoiding common pitfalls, and leveraging advanced features for robust data abroad.

Sarah Jenkins
A woman stands in a bustling international airport terminal, looking thoughtfully at her smartphone with a travel backpack at her feet, considering her connectivity options.Savings & Comparisons

Free eSIM Trials & Unlimited Data: What's the Catch for Travelers? (2026)

Many 'free unlimited data' eSIM trials promise seamless international connectivity, but the reality for travelers often involves significant speed throttling, restrictive fair usage policies, and unexpected geographic limitations. Before relying on these offers for your next trip, understand the technical fine print that dictates their true utility.

Sarah Jenkins
A woman confidently navigating her smartphone on a busy street in New York City's Greenwich Village, looking up at a historic brownstone.Destination Guides

USA eSIM for Tourists: Best Data Plans, Activation, & My 2026 Picks

Navigating the vastness of the United States as an international visitor means more than just booking flights and hotels; it means staying connected without breaking the bank. Forget the days of hunting for SIM cards in unfamiliar airports, a good eSIM is your digital passport to hassle-free data across all 50 states.

Sarah Jenkins
A person looking at their iPhone with a happy expression while sitting at a bustling outdoor cafe in Paris, with the Eiffel Tower visible in the background, suggesting seamless connectivity.eSIM 101 / Tech Hub

eSIM for iPhones: The Definitive Guide to International Data and VoLTE (2026 Edition)

Navigating international data on your iPhone used to mean swapping physical SIMs or dealing with expensive roaming. With eSIM, your iPhone becomes a truly global device. This guide delves into the specifics, from activation to optimizing your connectivity for international travel in 2026.

Sarah Jenkins
A woman at a bustling train station in Tokyo, Japan, checking her smartphone with a thoughtful expression, surrounded by the blur of commuters.How-to & Guides

eSIM SMS: Can You Text While Traveling in 2026? A Technical Deep Dive

A common concern for travelers adopting eSIMs is text message (SMS) compatibility. While many data-only travel eSIMs do not natively support traditional SMS, there are crucial technical nuances and effective alternatives to ensure you stay connected with friends and family abroad.

Sarah Jenkins
A young woman with a travel backpack, checking her phone for signal at a bustling train station in Berlin, looking slightly frustrated.Savings & Comparisons

T-Mobile eSIM Free Trial: Is It Really Free, Or Just a Hook? (2026 Review)

Think T-Mobile's eSIM free trial is your ticket to pre-trip data peace of mind? Not so fast. As a budget backpacker, I've seen enough 'free' offers to know they often hide a catch. Let's dig into the fine print and see if this trial actually serves the savvy traveler in 2026, or if it's just another way to get you on their hook.

Sarah Jenkins
A diverse family of three (parents and a young child) at an outdoor cafe table overlooking a European city square. The father is pointing at a tablet, with the mother and child looking on. Historic buildings and lively street life are blurred in the background, under cinematic natural light.How-to & Guides

Boost Your Travel Earnings: An Affiliate Guide for Globetrotting Parents (2026)

As a veteran parent traveler, I've learned that making your adventures pay for themselves is the ultimate hack. Dive into the world of travel affiliate programs, discovering how to generate real income from your family trips, fund future explorations, and keep those kids' iPads streaming without breaking the bank.

Sarah Jenkins
A hand holding a smartphone with an Indonesian landscape in the background, contrasting with a generic physical SIM card in the foreground, representing digital versus traditional tourist connectivity.Destination Guides

Telkomsel eSIM for Indonesia 2026: Tourist SIM vs. Digital Convenience

Indonesia beckons, but how will you stay connected? The choice between a physical Telkomsel tourist SIM and a modern Telkomsel eSIM can make or break your trip. I've trekked through countless airports, fumbled with tiny SIM trays, and now, I'm sharing the smarter way to get online in Bali, Jakarta, and beyond.

Sarah Jenkins
A woman confidently navigating the modern architecture of Baku, Azerbaijan, with a smartphone in hand, checking her eSIM connection.Destination Guides

Azerbaijan eSIM 2026: Your Guide to Seamless Data in Baku & Beyond

Navigating mobile data in Azerbaijan can be complex, but with the right eSIM, you can ensure seamless connectivity from Baku's Flame Towers to the ancient streets of Sheki. This guide breaks down your best options for 2026, comparing local carrier performance against the flexibility and cost-effectiveness of international eSIMs.

Sarah Jenkins
A young backpacker navigating the bustling streets of Myeongdong, Seoul, using their smartphone for directions, with vibrant neon signs and street food stalls in the background under a soft evening glow.Destination Guides

South Korea Fun Facts: 15 Things to Know Before You Go (2026)

South Korea isn't just K-pop and kimchi. It's a country of fascinating contrasts, deep history, and surprising quirks that can catch even the seasoned traveler off guard. Before you pack your bags, here are 15 things I've learned from my own shoestring trips, designed to save you time, money, and a bit of cultural confusion.

Sarah Jenkins
A family on a summer road trip, with an adult using a smartphone for GPS and two happy children entertained in the back seat, set against a blurred scenic American highway.Travel Styles / Personas

US Summer Road Trip 2026: The eSIM That Keeps Your GPS & Kids Happy

Packing for a family road trip means juggling snacks, car games, and endless device charging. But what about the data that keeps everyone connected, from GPS navigating through unexpected detours to two kids streaming Disney+ in the back seat? As a veteran of thirty countries with my own 4-to-12-year-olds, I've learned that reliable data is the unsung hero of any successful family adventure. Let's talk about how an eSIM can be your secret weapon for a stress-free US summer road trip.

Sarah Jenkins
A cinematic photo of a traveler using a smartphone in front of the historic Registan Square in Samarkand, Uzbekistan, at golden hour, symbolizing modern connectivity in an ancient Silk Road setting.Destination Guides

Central Asia eSIM 2026: Silk Road Data, No Budget Bust

My last Central Asia trip, 18 days across Kyrgyzstan, Uzbekistan, and Kazakhstan, cost me €85 on data with an eSIM. That's about €4.70 a day. Forget hunting for local SIMs or getting scammed at border crossings. This is how you stay online and on budget.

Sarah Jenkins
A digital nomad sits focused at a laptop in a bustling Athens co-working space, a coffee cup and a smartphone with an eSIM QR code visible on the table, with sunlight streaming through large windows.Destination Guides

Cosmote eSIM Greece: Your Nomad's 2026 Activation & Data Strategy

Navigating Greek mobile networks can be a headache, especially for long-term stays. Cosmote offers eSIMs, a convenient option for tourists and digital nomads. This guide cuts through the confusion, detailing activation, best plans, and crucial network insights for a smooth 2026 trip.

Sarah Jenkins