Hieu Nguyen

Hi, I'm Hieu. I love to travel and I love technology, and I'm happiest where the two meet. I enjoy digging into how things actually work on the road, from setting up an eSIM before a flight to keeping mobile data simple and affordable abroad, then sharing what I find so your next trip is a little easier.

I've worked in SEO for six years, focusing on content written for real readers: clear answers to the questions people actually ask, not pages written for search engines. On the BitJoy blog I write about eSIMs, mobile data and staying connected while travelling. I'm based in Ho Chi Minh City.

Latest articles by Hieu Nguyen

esimtraveltravel-guide

How to Turn Off Data Roaming on iPhone and Android

📅 October 04, 2026 - 12:00 PM

Turn off data roaming on iPhone, Samsung, or Pixel. Check the correct SIM, keep travel data working, and understand which calls and texts may still cost extra.

How verification codes actually work with SIM, eSIM, and Wi‑Fi Calling

esimtraveltravel-guide

eSIM Verification Codes: SMS & Wi-Fi Calling Fixes

📅 October 04, 2026 - 12:00 PM

Can an eSIM receive verification codes over Wi-Fi Calling? Check the receiving number, SMS support, carrier connection, and sender restrictions before changing settings. Includes iPhone checks, controlled troubleshooting, and travel-plan...

esimtraveltravel-guide

How to Keep Your eSIM When Resetting Your Phone

📅 October 04, 2026 - 12:00 PM

Resetting your phone does not always delete your eSIM. Learn how to keep it on iPhone, Samsung, or Pixel, prepare safely, and troubleshoot a missing or disconnected profile.

eSIM Compatible Tablets 2025: Complete Guide to iPad, Samsung Galaxy Tab & Surface

esimtraveltravel-guide

Tablets With eSIM: iPad, Samsung & Surface (2026)

📅 October 04, 2026 - 12:00 PM

Check which cellular iPads, Samsung Galaxy Tabs, and Windows tablets support eSIM, including regional limits and setup steps.

esimtraveltravel-guide

How to Check Data Usage on iPhone: Monthly & eSIM

📅 October 04, 2026 - 12:00 PM

Find your iPhone’s cellular usage, understand Current Period, track the right eSIM line, and compare device readings with your provider’s data allowance.

esim

EID Number: What It Is, How to Find It & EID vs IMEI vs ICCID

📅 October 04, 2026 - 12:00 PM

Find and check your 32-digit EID on phones and watches, compare EID vs IMEI vs ICCID, and troubleshoot missing identifiers or eSIM activation errors.

esimSwedentraveltravel-guide

Sweden SIM Card: Tourist Prices, Where to Buy & ID (2026)

📅 October 02, 2026 - 12:00 AM

Compare Sweden prepaid SIMs and travel eSIMs, with current prices, passport registration, airport buying tips, and clear advice on calls, data, and setup.

Quick Fixes First – Try These in the Next 2 Minutes

esimtraveltravel-guide

eSIM No Service? Fix iPhone & Android Step by Step (2026)

📅 October 01, 2026 - 12:00 PM

eSIM says No Service, Searching, or SOS? Follow these fixes in order on iPhone and Android, from line settings and coverage to carrier support.

Quick Answer – How Much Data Do You Need for Your Trip?

esimtraveltravel-guide

How Much Data Do I Need for Travel? GB by Trip Length (2026)

📅 October 01, 2026 - 12:00 PM

How much data do you need for travel? Compare GB for 3 days, 1 week, 2 weeks, or a month, then calculate your plan with a 20% buffer.

Ogoh-Ogoh parade in Bali before Nyepi — AI-generated illustration

Indonesiatraveltravel-guide

Bali Festivals 2026–2027: Month-by-Month Calendar & Dates

📅 October 01, 2026 - 12:00 PM

Plan around Bali festivals with 2026–2027 dates, upcoming events, Nyepi, Galungan, cultural meanings, locations, and practical travel tips.

esimtraveltravel-guide

Can You Use a Phone Without a SIM Card? What Works & Setup

📅 October 01, 2026 - 12:00 PM

Yes—an already set-up phone can use Wi-Fi apps, its camera, and offline tools without a SIM card. Carrier calls, SMS, and mobile data need active service.

esimtraveltravel-guide

SIM Card Not Working? Fix No SIM, No Service & Data (2026)

📅 October 01, 2026 - 12:00 PM

SIM card not working? Match the error first, then check the line, carrier account, SIM fit, and phone settings. Follow the relevant iPhone or Android fixes.