David "Dave" Miller
Technical Support Lead & Troubleshooting Guru · Cellesim
Reporting from the tech hub of Seattle, David 'Dave' Miller is the Technical Support Lead for Cellesim. With a background in mobile hardware repair, Dave focuses on the nitty-gritty of connectivity. He creates deep-dive troubleshooting guides for 'Sim Not Supported' errors, locked devices, and manual activation codes. Dave is the go-to expert when the QR code doesn't work and you need a technical fix fast.
Related reading(24)
Japan eSIM Guide 2026: Navigating Data Plans and Connectivity
Japan's mobile networks are a marvel of engineering, but navigating data plans as a traveler can be complex. This guide cuts through the noise, offering clear, technical insights into the best eSIM options for 2026, ensuring you stay connected from Tokyo's Shibuya Crossing to Kyoto's serene temples.
Activating AT&T eSIM for International Roaming: A 2026 Engineer's Guide
Navigating international data with AT&T can feel like deciphering a 3GPP specification. This guide cuts through the noise, showing AT&T customers how to activate their eSIM for global travel, scrutinizing cost, performance, and crucial technical details to ensure you stay connected without bill shock.
USA Travel: Ditch Roaming, Save Big with eSIM in 2026
Forget overpriced roaming and hunting for sketchy Wi-Fi. For my last 8-day sprint through the US, I spent just $28 on data with an eSIM, a fraction of what I'd pay for a local physical SIM, let alone my home carrier's roaming fees. Let's break down how to get the most bang for your buck.
USA Travel in 2026: The Savvy Parent's eSIM Strategy
Navigating the USA with kids means managing devices, screen time, and staying connected without breaking the bank. This guide cuts through the noise, offering a parent's perspective on the best eSIM options for a smooth, data-rich family vacation in 2026.
Summer 2026: Ditch Roaming Fees, Embrace eSIM for European Adventures
Planning your European summer escape for 2026? Don't let exorbitant roaming fees from your home carrier dampen your adventure. eSIMs offer a robust, flexible, and significantly more affordable solution for staying connected across Italy, France, Greece, and beyond. This deep dive, from a telecom engineer's perspective, will detail exactly how to optimize your mobile data, avoid common pitfalls, and ensure your device performs optimally on European networks.
T-Mobile eSIM Free Trial: A Parent's Data Dilemma Abroad 2024
When you're planning a trip abroad with kids, every detail matters, especially keeping their devices connected without breaking the bank. The T-Mobile eSIM free trial often pops up as a tempting option, but is it genuinely enough to cover Disney+ streams, Minecraft multiplayer, and those crucial offline map downloads for the whole family?
T-Mobile eSIM QR Code: Getting & Activating for Global Roaming 2026
Navigating T-Mobile's eSIM system for international travel can be a maze, especially when you're trying to use it alongside a budget-friendly travel eSIM. This guide cuts through the noise, showing you exactly how to get your T-Mobile eSIM QR code, activate it, and keep your primary number active while relying on a Cellesim plan abroad. We'll tackle dual-SIM management and common activation headaches.
Cellesim vs Telcel Mexico: The Digital Nomad's Connectivity Guide
Choosing between a Cellesim eSIM and a local Telcel SIM for Mexico? This guide breaks down the real-world costs, coverage, and convenience for digital nomads.
Savings & ComparisonsSingapore Roaming Shock: Save 70% on Data with an eSIM in 2026
A 7-day Singapore trip can cost $150+ in roaming. Discover how Cellesim eSIMs reduce that to $15. Compare costs, avoid bill shock, and get connected instantly in 2026.
Destination GuidesPortugal Roaming Costs $15/Day: The 2026 eSIM Alternative for Travelers
Portugal roaming bills average $15/day. Compare 2026 eSIM plans, discover seamless connectivity from Lisbon to the Algarve, and save up to 90% on data. Avoid bill shock.
Destination GuidesKingstown to La Soufrière: Your eSIM Guide for St. Vincent Island
Explore St. Vincent from Kingstown to La Soufrière with reliable eSIM data in 2026. Get instant connectivity, avoid roaming, and travel smart. Buy your Cellesim eSIM today!
Destination GuidesT-Mobile International Data Pass Alternatives: Discover Cellesim eSIM
Ditch expensive T-Mobile International Data Passes in 2026. Discover Cellesim eSIM for faster speeds, wider coverage, and transparent pricing. Explore plans now!
Destination GuidesBest eSIM for Kosovo Travel 2026: Your Connectivity Guide
Stay connected in Kosovo with Cellesim eSIM in 2026. Get instant data, avoid roaming fees, and explore Pristina, Prizren, and beyond. Buy your Kosovo eSIM today.
Destination GuidesUltimate Guide to Internet for Your Alps Ski Holiday 2026
Ensure seamless connectivity on your 2026 Alps ski holiday with an eSIM. Get high-speed internet in France, Switzerland, Austria & more. Explore Cellesim plans now!
eSIM 101 / Tech HubCellesim: Your Ultimate Guide to Choosing the Best eSIM Provider in 2026
Find the top eSIM provider for your 2026 travel. Explore Cellesim's global coverage, seamless activation, and competitive plans. Stay connected effortlessly!
Savings & ComparisonsEgypt eSIM vs. SIM Card 2026: The Ultimate Cost & Convenience Guide
Traveling to Egypt in 2026? Compare eSIM vs. local SIM vs. roaming for data. Uncover hidden costs & find the cheapest way to stay connected. Get your Egypt eSIM today!
Destination GuideseSIM vs. Local SIMs for a North America Road Trip (2026)
Planning a 2026 North America road trip? Discover if eSIMs or local SIMs offer the best data, cost, and convenience. Get seamless connectivity now.
Destination GuidesParis in Spring 2026: Your Ultimate Guide to Parks, Cafes & eSIMs
Planning a trip to Paris in Spring 2026? Discover essential tips for parks, cafes, and staying connected with a Cellesim eSIM. Learn more now!
Destination GuideseSIM for Travel to Costa Rica: Your 2026 Connectivity Guide
Planning a trip to Costa Rica in 2026? Discover how Cellesim eSIM offers instant, reliable, and affordable connectivity. Avoid roaming fees and stay connected effortlessly. Explore plans now!
Savings & ComparisonsDiscover the Cheapest eSIM Plans for 2026 Global Travel
Find the cheapest eSIM plans for global travel in 2026. Save on data roaming with Cellesim's affordable, instant activation eSIMs. Explore plans now!
Destination GuidesHow to Avoid Roaming Fees on Your 2026 Italy Summer Vacation
Planning your 2026 Italy vacation? Discover how to eliminate expensive roaming fees and stay connected effortlessly with Cellesim eSIM. Get instant data now!
eSIM GuideCanton Fair 2026: The Business Traveler's Ultimate eSIM Guide
Prepare for the Canton Fair 2026 with the ultimate business traveler's guide to eSIMs. Learn how to stay connected in Guangzhou, avoid high roaming charges, and set up your China eSIM for a seamless trip.
Travel Styles / PersonasItaly During Easter 2026: The Ultimate Connectivity Guide
Planning your Easter 2026 trip to Italy? Our guide breaks down whether an eSIM, local SIM, or roaming is best for staying connected. Make the smart choice before you fly.
eSIM GuideYour Ultimate Bali eSIM Guide: Seamless Connectivity for 2026
Get ready for your 2026 Bali adventure with our complete guide to eSIM technology. Learn how to set up, activate, and manage your travel data with confidence.