Repair Tips & Guides
Expert advice on repairs, costs and devices from our certified technicians.
What Is Wi-Fi Calling? How It Works and When to Use It
Wi-Fi Calling lets you make and receive phone calls over internet instead of cell towers — here's how to turn it on, when it matters most, and its limits.
eSIM for China Travel: Best Options for Chinese-Americans (2025)
Heading to China? Your US SIM card won't cut it. A practical guide to eSIM options, Chinese carrier plans, dual-SIM phones, and what to set up before you leave.
AT&T Coverage in Southern California: A Chinese-American Resident's Guide
AT&T's SoCal coverage for Chinese-American communities: SGV signal quality, China calling options, band compatibility for Chinese phones, and MVNO alternatives.
How to Unlock Your Phone for AT&T
Carrier-locked phone? How to check your lock status, what carriers require before unlocking, how to request it — and how to bring the unlocked phone to AT&T.
Phone Plans for International Students
F-1 with no SSN, or a local freshman leaving the family plan? The student playbook: passport-only prepaid, campus coverage checks, family-plan math versus going solo, and the one-visit back-to-school setup.
Porting Your Number From T-Mobile or Verizon to AT&T
The carrier-specific exit manual: exactly where the Transfer PIN lives in the T-Mobile and Verizon apps, when in your billing cycle to jump, what happens to unpaid installments, and how to confirm the old account really closed.
Phone Says 'No Service'? Here's How to Fix It
Work the ladder before you panic: airplane mode, restart, SIM reseat, carrier settings, network reset — plus eSIM failure cases, how to tell a SIM problem from dead radio hardware, and when a free diagnostic settles it.
How to Activate an eSIM on AT&T
Step-by-step AT&T eSIM activation for all three scenarios — new line, porting in, or moving to a new phone — with fixes for stuck transfers and dead old phones.
eSIM vs Physical SIM: Which Should You Use?
eSIM or physical SIM? A plain-English comparison of phone switching, dual SIM, travel, and security — plus why US iPhones no longer have a SIM tray at all.
Best Options for Calling China From the US
WeChat covers most calls home — until Mom's landline rings. Here's when you actually need real international calling, which carrier options fit, how to dial 011+86, and the combo setup that costs the least.
Bring Your Own Device to AT&T: Full Guide
Your phone can probably come with you. The two gates it must pass (unlocked + compatible), how to check the IMEI, the honest BYOD-vs-financed math, and the free in-store check that settles it before you commit.
AT&T Prepaid vs Postpaid: Which Is Right for You?
The real differences between AT&T prepaid and postpaid — credit checks, network priority, roaming, family discounts, and device deals — and when each one wins.
