"I just switched to T-Mobile, but my phone's data isn't working. I think I need the right APN settings. Can someone help?"
This is one of the most common hiccups after you join T-Mobile or move your SIM into a new phone. The Access Point Name (APN) is the small block of settings that tells your phone how to reach the carrier network for data and picture messaging.
We cut through tech confusion with clear answers. That's been our job since 2012.
On most modern phones the APN fills in automatically the moment a T-Mobile SIM is inserted. When it does not, or when an update wipes it, you can enter the values by hand. This guide gives you the exact settings and the menu path for every device type.
When You Actually Need This
Most current iPhones and Android phones detect the T-Mobile APN on their own, so you rarely have to touch it. You only need to enter settings manually when data or MMS stops working and the network is otherwise fine.
The usual triggers are a fresh SIM swap, a phone that was bought unlocked or from another carrier, or a major software update. Apple confirms that updating iOS resets any manual changes you made to your APN, so a working phone can suddenly go quiet after an update.
Before you edit anything, confirm the basics. Make sure mobile data is on, your plan is active, the SIM is seated and undamaged, and the phone is unlocked. If a locked phone still shows another carrier's profile, the APN screen may be hidden or read-only.
T-Mobile APN Settings for Android
Enter these values on an Android phone, tablet, or cellular smartwatch. Leave any field blank or set to Not set unless a value is listed.
- Name: T-Mobile
- APN:
fast.t-mobile.com - Proxy: Not set
- Port: Not set
- Username: Not set
- Password: Not set
- Server: Not set
- MMSC:
http://mms.msg.eng.t-mobile.com/mms/wapenc - MMS proxy: Not set
- MMS port: Not set
- MCC: 310
- MNC: 260
- Authentication type: Not set (or None)
- APN type:
default,supl,mms(some phones label this Internet + MMS) - APN protocol: IPv4/IPv6
- APN roaming protocol: IPv4/IPv6
- Bearer: Unspecified
The APN protocol matters more than people expect. T-Mobile runs a dual-stack network, so set both protocol fields to IPv4/IPv6 rather than IPv4 only. After you save, restart the phone or toggle Airplane Mode so it re-registers.
Steps for Samsung Galaxy
Samsung phones running One UI keep the APN list under the connections menu. The path is consistent across recent Galaxy models.
Settings > Connections > Mobile networks > Access Point Names
Tap Add or the plus icon to create a new APN, enter the values above, then tap the menu (three dots) and Save. Back on the Access Point Names screen, select the APN you just created so its radio button is filled. Older Galaxy models may list it under Settings > More networks > Mobile networks instead.
Steps for Google Pixel
Pixel and stock Android phones tuck the APN list inside the SIM settings. The exact wording shifts slightly by Android version.
Settings > Network & internet > SIMs > Access Point Names
If you do not see Access Point Names right away, select your SIM first, then scroll down to find it. Tap the plus icon to add the APN, fill in the values, tap the three dot menu, and choose Save. Then pick the new APN from the list so it is the active one.
T-Mobile APN Settings for iPhone and iPad
On most iPhones the APN loads by itself when you insert a T-Mobile SIM, and Apple notes that the values are detected automatically on iOS 16 and iPadOS 15 and later. You only enter them by hand if data or MMS fails and the network is otherwise active.
Whether you can edit the APN at all depends on the carrier and whether the phone is unlocked. If the Cellular Data Network screen is missing, the device is treating the APN as locked and you cannot change it manually.
To reach the screen, use one of these paths depending on your iOS version.
Settings > Cellular > Cellular Data Network
Settings > Mobile Data > Mobile Data Options > Mobile Data Network
Enter these values in the matching sections.
- Cellular Data (APN):
fast.t-mobile.com - Username: blank
- Password: blank
- MMS APN:
fast.t-mobile.com - MMSC:
http://mms.msg.eng.t-mobile.com/mms/wapenc - MMS Proxy: blank
- MMS Max Message Size: 1048576
- MMS UA Prof URL:
http://www.apple.com/mms/uaprof.rdf - Personal Hotspot (if shown): APN
pcweb.tmobile.com, Username and Password blank
If Settings Are Missing or Reset
If the APN screen is empty or the fields keep reverting, a carrier profile usually fixes it faster than manual entry. iPhones receive these automatically, so check for one first.
Settings > General > About
If a carrier settings update is waiting, a prompt appears here after a few seconds. Install it, then recheck your data. Apple warns that any manual APN edits are wiped when you update iOS, so reentering the values after a major update is normal.
When fields are missing entirely on either platform, leave them blank rather than guessing. A blank MMS proxy or port is correct for T-Mobile, and inventing a value can break messaging.
Default and Older Device Settings
Basic phones, cellular hotspots, and older handsets use the same core values, just with a simpler screen. Enter the APN and MMSC and leave everything else unset.
- APN:
fast.t-mobile.com - MMSC:
http://mms.msg.eng.t-mobile.com/mms/wapenc
On Windows-based or feature phones the menu may read Settings > Network & wireless > Cellular & SIM > SIM settings. If the interface has no MMS proxy or port field, that is expected, so skip it.
Extra Tips That Help
After saving, restart the phone or switch Airplane Mode on for about 15 seconds and back off. This forces the phone to re-register with the tower and pick up the new settings.
Confirm your phone supports T-Mobile's bands, especially for 5G. Even perfect APN values cannot create a connection if the hardware does not support the frequencies in your area, which is common with phones built for other regions or carriers.
If your device offers 5G Standalone and Voice over 5G Standalone toggles, turning them on can help on T-Mobile's network. When data still fails after all of this, reset network settings and then contact T-Mobile support, since a SIM or account issue may be the real cause.
Frequently Asked Questions
Do I need a special APN for 5G on T-Mobile?
No. The same APN, fast.t-mobile.com, works for LTE and 5G, including standalone 5G, for both data and MMS. What matters is setting the APN protocol to IPv4/IPv6 and enabling the correct network mode on your phone.
What if data still will not work after I enter these settings?
Double-check the spelling of every value, confirm mobile data is on, and make sure you have T-Mobile signal and an active plan. Then reset network settings, verify the phone is unlocked, and if nothing helps, contact T-Mobile support.
Will these settings let me send MMS?
Yes. The MMSC address plus an APN type that includes mms (or the Internet + MMS option) covers picture messaging. If MMS fails while roaming, make sure mobile data stays on, since MMS rides on the data channel.
Why do iPhone fields look different from Android?
iPhones group the values under Cellular Data, MMS, and Personal Hotspot rather than one long list, and recent iOS versions may hide or auto-fill some fields. Fill in each field that is shown, especially APN and the MMS values, and leave hidden ones alone.
Why did my APN disappear after an update?
Apple confirms that updating iOS resets manual APN changes, and major Android updates can do the same. Reenter the values or install the current carrier settings update, and consider that a carrier profile survives future updates better than manual edits.
How do I reset the APN to default?
On Android, open Access Point Names, tap the three dot menu, and choose Reset to default. On iPhone, go to Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings, then let the T-Mobile profile reload.
First published February 9, 2025. Last updated June 4, 2026.
