Author
Derek Alvarez
Connectivity & Gear Editor
Connectivity & Gear Editor
Derek Alvarez
Miami, FL
Miami-based technology writer covering mobile connectivity, travel gear, and the infrastructure that keeps travelers online. Spent twelve years as an enterprise IT consultant before realizing he preferred writing about the equipment to maintaining it. Tests every eSIM, hotspot, and charging brick he reviews — usually in places with questionable coverage. Cuban-American, fluent in Spanish, collects old film cameras he rarely uses.
Articles by Derek
- eSIM review
99esim Review (2026): 155 countries, custom plans, group sharing
A year of testing 99esim across Europe, Asia, Latin America, and the US: where it wins (custom plans, group eSIMs, country count), where it falls short, and who it's for.
9 min read
- Comparison
Airalo alternative: 99esim compared (2026)
Looking for an Airalo alternative? 99esim head-to-head with Airalo — country count, plan structure, group sharing, North America scope, support speed.
9 min read
- Traveler persona
The Cruise Passenger's connectivity playbook
Port-hopping with shore time, ship Wi-Fi that costs $30/day, and data needs only when you're off the boat. eSIM picks for cruisers, what works in port, and the case against the ship's package.
7 min read
- Traveler persona
The First-Time International Traveler's connectivity playbook
First passport stamp coming up. The plain-English explainer of what an eSIM is, why it beats the alternatives, and the simplest setup that just works without learning the telecom jargon.
7 min read
- Connectivity
Does my phone support eSIM? How to check in under a minute
A 30-second dialer check, the Settings path on iPhone and every major Android, a full compatibility list by brand and year, and the carrier-lock gotcha that trips people up.
8 min read
- Connectivity
Can I use eSIM and physical SIM at the same time?
Yes on every modern iPhone and most Android flagships. Here's how dual-SIM actually works, the setup for travel (home SIM for 2FA, eSIM for data), and the device-specific gotchas.
7 min read
- Connectivity
eSIM not working: 10 fixes to try first
The eSIM troubleshooting checklist — in the order problems actually happen. Airplane-mode reset, Data Roaming toggle, line priority, APN, carrier lock, signal. Works for iPhone and Android.
8 min read
- Connectivity
Can I hotspot from a travel eSIM?
Usually yes — most travel eSIMs allow hotspot/tethering. Cheap plans sometimes restrict it, unlimited plans sometimes throttle it. Here's what to check before relying on it for a laptop or tablet.
6 min read
- Connectivity
How much data do I need for travel?
Data usage by app (Google Maps, WhatsApp, Instagram, streaming), rule-of-thumb tables, and a light/moderate/heavy framework to pick the right travel eSIM plan size.
6 min read
- Connectivity
How to install an eSIM on iPhone: step-by-step
Every iPhone eSIM install method in one place — QR scan, manual entry, iOS 17.4+ direct install, and eSIM Quick Transfer from an old iPhone. Plus the setup steps most guides skip.
7 min read
- Destination
Best eSIM for Bahrain
Best eSIM for Bahrain: starting prices, Batelco and STC coverage, F1 weekends and business trips to Manama, and how the major providers compare.
5 min read
- Destination
Best eSIM for Bangladesh
Best eSIM for Bangladesh: starting prices, Grameenphone and Robi coverage, Dhaka business and Cox's Bazar trips, and how the major providers compare.
6 min read
- Destination
Best eSIM for Belgium
Best eSIM for Belgium: starting prices, Proximus and Orange coverage, Brussels EU trips and Bruges canals, and how the major providers compare.
6 min read
- Destination
Best eSIM for Bosnia and Herzegovina
Best eSIM for Bosnia and Herzegovina: starting prices, BH Telecom and m:tel coverage, Sarajevo and Mostar trips, and how the major providers compare.
6 min read
- Destination
Best eSIM for Cambodia
Best eSIM for Cambodia: starting prices, Cellcard and Smart coverage, Angkor temple weeks and Phnom Penh trips, and how the major providers compare.
6 min read
- Destination
Best eSIM for Cayman Islands
Best eSIM for Cayman Islands: starting prices, FLOW and Digicel coverage, Seven Mile Beach weeks and dive trips, and how the major providers compare.
5 min read
- Destination
Best eSIM for China
Best eSIM for China: starting prices, China Mobile and China Unicom coverage, and how the major providers compare.
6 min read
- Destination
Best eSIM for Colombia
Best eSIM for Colombia: starting prices, Claro and Movistar coverage, and how the major providers compare.
6 min read
- Destination
Best eSIM for the DRC
Best eSIM for the DRC: starting prices, Vodacom and Orange coverage, Kinshasa trips and eastern deployments, and how the major providers compare.
5 min read
- Destination
Best eSIM for Costa Rica
Best eSIM for Costa Rica: starting prices, Kölbi and Liberty coverage, volcano trips and Pacific-coast beach weeks, and how the major providers compare.
6 min read
- Destination
Best eSIM for diaspora travel
Best eSIM for diaspora travel: 99esim's 49-country plan spans the EU, Balkans, Central Asia, parts of Asia, and parts of the Americas.
6 min read
- Destination
Best eSIM for Dominica
Best eSIM for Dominica: starting prices, Digicel and FLOW coverage, Boiling Lake hikes and whale-watching trips, and how the major providers compare.
5 min read
- Destination
Best eSIM for El Salvador
Best eSIM for El Salvador: starting prices, Claro and Tigo coverage, San Salvador trips and El Tunco surf weeks, and how the major providers compare.
5 min read
- Destination
Best eSIM for Ethiopia
Best eSIM for Ethiopia: starting prices, Ethio Telecom and Safaricom coverage, and how the major providers compare.
5 min read
- Destination
Best eSIM for Finland
Best eSIM for Finland: starting prices, Telia and Elisa coverage, Helsinki weekends and Lapland northern-lights trips, and how the major providers compare.
6 min read
- Destination
Best eSIM for French Polynesia
Best eSIM for French Polynesia: starting prices, Vini and Vodafone coverage, Bora Bora honeymoons and Tuamotu diving, and how the major providers compare.
5 min read
- Destination
Best eSIM for Gibraltar
Best eSIM for Gibraltar: starting prices, GibTel coverage, day trips from Spain and longer stays, and how the major providers compare.
5 min read
- Destination
Best eSIM for Guyana
Best eSIM for Guyana: starting prices, Digicel and GTT coverage, Georgetown trips and Kaieteur Falls flights, and how the major providers compare.
5 min read
- Destination
Best eSIM for Hong Kong
Best eSIM for Hong Kong: starting prices, CSL and 3HK coverage, short business visits and cultural weekends, and how the major providers compare.
5 min read
- Destination
Best eSIM for Iceland
Best eSIM for Iceland: starting prices, Síminn and Vodafone Iceland coverage, and how the major providers compare.
6 min read
- Destination
Best eSIM for Indonesia
Best eSIM for Indonesia: starting prices, Telkomsel and Indosat coverage, Bali weeks and Jakarta business trips, and how the major providers compare.
6 min read
- Destination
Best eSIM for Kenya
Best eSIM for Kenya: starting prices, Safaricom and Airtel coverage, safari trips and Mombasa beach weeks, and how the major providers compare.
6 min read
- Destination
Best eSIM for Kyrgyzstan
Best eSIM for Kyrgyzstan: starting prices, MegaCom and Beeline coverage, Bishkek trips and Song-Kul horse treks, and how the major providers compare.
5 min read
- Destination
Best eSIM for Liechtenstein
Best eSIM for Liechtenstein: starting prices, FL1 and Swisscom coverage, Vaduz day trips and alpine hikes, and how the major providers compare.
5 min read
- Destination
Best eSIM for Madagascar
Best eSIM for Madagascar: starting prices, Telma and Orange coverage, Antananarivo arrivals and lemur-reserve trips, and how the major providers compare.
6 min read
- Destination
Best eSIM for Mexico
Best eSIM for Mexico: starting prices, Telcel and Movistar coverage, CDMX trips and Yucatán circuits, and how the major providers compare.
6 min read
- Destination
Best eSIM for the Middle East
Best eSIM for the Middle East: one plan across 11 countries. Compare 99esim, Airalo, Holafly, Nomad, and Ubigi by coverage and price.
6 min read
- Destination
Best eSIM for Monaco
Best eSIM for Monaco: starting prices, Monaco Telecom and Orange coverage, Grand Prix weekends and Riviera circuits, and how the major providers compare.
5 min read
- Destination
Best eSIM for Mongolia
Best eSIM for Mongolia: starting prices, Mobicom and Unitel coverage, Ulaanbaatar arrivals and ger-camp trips, and how the major providers compare.
6 min read
- Destination
Best eSIM for Montenegro
Best eSIM for Montenegro: starting prices, Crnogorski Telekom and Mtel coverage, Kotor bay visits and Durmitor hiking, and how the major providers compare.
5 min read
- Destination
Best eSIM for Montserrat
Best eSIM for Montserrat: starting prices, Digicel and FLOW coverage, and how the major providers compare.
5 min read
- Destination
Best eSIM for Morocco
Best eSIM for Morocco: starting prices, Maroc Telecom and Orange coverage, Marrakech trips and Sahara desert tours, and how the major providers compare.
6 min read
- Destination
Best eSIM for Mozambique
Best eSIM for Mozambique: starting prices, Vodacom and Movitel coverage, Maputo business trips and Tofo beach visits, and how the major providers compare.
5 min read
- Destination
Best eSIM for New Zealand
Best eSIM for New Zealand: starting prices, Spark and One NZ coverage, North Island trips and Fiordland adventures, and how the major providers compare.
6 min read
- Destination
Best eSIM for Nicaragua
Best eSIM for Nicaragua: starting prices, Claro and Tigo coverage, Granada visits and San Juan del Sur surf trips, and how the major providers compare.
5 min read
- Destination
Best eSIM for Papua New Guinea
Best eSIM for Papua New Guinea: starting prices, Digicel and bmobile coverage, and how the major providers compare.
6 min read
- Destination
Best eSIM for Portugal
Best eSIM for Portugal: starting prices, MEO and Vodafone Portugal coverage, and how the major providers compare.
6 min read
- Destination
Best eSIM for Russia
Best eSIM for Russia: starting prices, MTS and MegaFon coverage, Moscow business and St. Petersburg cultural visits, and how the major providers compare.
6 min read
- Destination
Best eSIM for Rwanda
Best eSIM for Rwanda: starting prices, MTN Rwanda and Airtel coverage, Kigali business and gorilla-trek itineraries, and how the major providers compare.
6 min read
- Destination
Best eSIM for Saint Kitts and Nevis
Best eSIM for Saint Kitts and Nevis: starting prices, FLOW and Digicel coverage, and how the major providers compare.
5 min read
- Destination
Best eSIM for Saint Lucia
Best eSIM for Saint Lucia: starting prices, FLOW and Digicel coverage, Castries arrivals and Pitons resort trips, and how the major providers compare.
5 min read
- Destination
Best eSIM for Serbia
Best eSIM for Serbia: starting prices, A1 Serbia and Yettel coverage, Belgrade business and Novi Sad cultural trips, and how the major providers compare.
5 min read
- Destination
Best eSIM for Slovakia
Best eSIM for Slovakia: starting prices, Orange Slovensko and O2 coverage, and how the major providers compare.
5 min read
- Destination
Best eSIM for Taiwan
Best eSIM for Taiwan: starting prices, Chunghwa Telecom and Taiwan Mobile coverage, Taipei stays and HSR rail trips, and how the major providers compare.
6 min read
- Destination
Best eSIM for Trinidad and Tobago
Best eSIM for Trinidad and Tobago: starting prices, Digicel and bmobile coverage, and how the major providers compare.
5 min read
- Destination
Best eSIM for Uganda
Best eSIM for Uganda: starting prices, MTN Uganda and Airtel coverage, and how the major providers compare.
6 min read
- Destination
Best eSIM for the UAE
Best eSIM for the UAE: starting prices, Etisalat and du coverage, and how the major providers compare.
6 min read
- Destination
Best eSIM for the UK
Best eSIM for the UK: starting prices, EE and Vodafone UK coverage, London city stays, Scotland road trips, and how the major providers compare.
6 min read
- Destination
Best eSIM for the USA
Best eSIM for the USA: starting prices, T-Mobile and AT&T coverage, and how the major providers compare.
6 min read
- Destination
Best eSIM for Armenia
Best eSIM for Armenia: starting prices, Ucom and Viva-MTS coverage, Yerevan and the monasteries, and how the major providers compare.
5 min read