Switched and data or MMS isn't working? It's almost always the APN.
After a port, your phone sometimes keeps the old carrier's APN. Pick your new carrier, copy the settings, restart — data, picture messages and hotspot should come back.
Pick your carrier
Each carrier on the left has its own page with the exact APN, MMSC, MCC/MNC values, iPhone and Android steps, and troubleshooting for that carrier.
APN settings by carrier — a full page for each
The quick picker above covers the fix in place. Each carrier also has its own page with the same settings, iPhone & Android steps and troubleshooting — open yours, or bookmark it for switch day.
iPhone eSIM switch checklist
- Settings → General → About — wait for carrier update
- Settings → Cellular — set Default Voice Line to new eSIM
- Turn Data Roaming ON for Fi / Visible travel
- iMessage: toggle off/on so it re-registers your number
Android eSIM switch checklist
- Settings → Connections → SIM manager — enable new eSIM
- Set Calls / Messages / Data to new SIM
- Delete old APNs, add the one above, select it
- Messages → RCS — verify number if chats pause
Port stuck? Fix in 5 mins
- Wrong transfer PIN is cause #1 — regenerate it in old app
- Name/ZIP must match old account exactly
- Don't use your new temp number to sign up for anything until port finishes