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(20)

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
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
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 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 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 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 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
A digital nomad sits at a wooden table in a busy Tokyo co-working space, focused on her laptop with a smartphone next to it, bathed in warm morning light streaming through a large window.Savings & Comparisons

Ubigi eSIM Japan vs. Cellesim: Best Data for Your Tokyo Trip 2026

Navigating Japan's mobile data scene can be tricky, especially with so many eSIM options. I've put Ubigi and Cellesim head-to-head for 2026, comparing their plans, speeds, and real-world performance in Tokyo. Here's what actually works and what just eats your yen.

Sarah Jenkins
A woman sits at an outdoor cafe in Florence, Italy, looking at her phone with a coffee and pastry on the table, surrounded by historic buildings.Destination Guides

TIM eSIM for Italy: Tourist Costs, ID Checks and Data Options

TIM eSIM in Italy: check the Tourist tariff’s total price, identification and activation process, then compare a local line with travel data.

Sarah Jenkins
A young woman backpacker, looking frustrated while trying to scan a QR code on her phone screen, sitting on a worn wooden bench at a bustling international airport gate in Southeast Asia.How-to & Guides

T-Mobile eSIM QR Code Not Working? Quick Fixes for Savvy Travelers 2026

Stuck abroad with a T-Mobile eSIM QR code that won't scan or activate? Don't let data woes derail your trip. This guide cuts straight to the tactical fixes, helping you get connected quickly and avoid those wallet-draining roaming charges, all while keeping your budget in check.

Sarah Jenkins
A group of friends laughing and taking selfies with their phones during a Halloween festival in Dublin, with historical buildings in the background and soft, twilight lighting.Events & Festivals

Ireland Halloween 2026: Samhain Festivals & eSIM Cost Breakdown

Ireland's Halloween, or Samhain, is more than just costumes. It's ancient festivals and spooky tours. Getting connected without breaking the bank? That's where an eSIM comes in. I'm breaking down exactly what you'll pay for data, comparing it to local options, and sharing my tactical tips for staying connected without overspending during your spectral adventures.

Sarah Jenkins
A person navigating the vibrant crowds of Notting Hill Carnival 2026, checking their phone for directions or messaging friends, with colourful floats and street performers in the background.Events & Festivals

Notting Hill Carnival 2026: Your eSIM & Mobile Data Guide for London's Biggest Street Party

Navigating Notting Hill Carnival's immense crowds requires more than just good vibes; reliable mobile data is crucial for safety, finding friends, and accessing event info. This guide, from a telecom engineer's perspective, cuts through the noise to deliver actionable advice on optimizing your connectivity with an eSIM, ensuring your data keeps pace with the festivities.

Sarah Jenkins
T-Mobile International Roaming: 2026 Guide to Data & CostsSavings & Comparisons

T-Mobile International Roaming: 2026 Guide to Data & Costs

Unravel T-Mobile international roaming in 2026. Learn about data passes, hidden costs, and why Cellesim eSIM offers better global connectivity. Explore plans today!

Sarah Jenkins
Gobi Desert Tour 2026: How to Stay Connected with a Gobi Desert eSIMTravel Styles / Personas

Gobi Desert Tour 2026: How to Stay Connected with a Gobi Desert eSIM

Embarking on a Gobi Desert adventure? This guide explains how a Gobi Desert eSIM offers seamless mobile data, helping you navigate and share your journey with confidence.

Sarah Jenkins
Budapest vs Prague 2026: Which Central European Capital Should You Visit This Spring? (A Connectivity Guide)Savings & Comparisons

Budapest vs Prague 2026: Which Central European Capital Should You Visit This Spring? (A Connectivity Guide)

Planning a trip to Central Europe? This guide breaks down the Budapest vs Prague debate from a traveler's connectivity perspective, comparing eSIMs and local SIMs.

Sarah Jenkins
Sarah Jenkins, Cellesim