If Straight Talk iPhone MMS not Working [How to Fix Guide]

Does your Straight talk iPhone MMS not working? Would you like to fix this problem and get more options from the iPhone 4 and 4S? This guide will explain how you can fix Straight Talk iPhone MMS error for iOS 6 firmware versions 6.0, 6.0.1, 6.1 and 6.1.3 using SIM Swap tool.

The instruction works for unlocked smartphones only. The 3GS model users can also follow the steps below to update mms settings for factory unlocked Straight Talk iPhone. You need to have one of the two SIM cards: My Simple Mobile or T-Mobile. You are also required to have a working and activated SIM card for Straight Talk. Make sure you have a tool to remove the SIM from your smartphone.

Fix Straight Talk iPhone MMS Issue Notes

Do not use the updated SIM swap tool till you remove the custom APN profile and reboot your handset. There is no need to jailbreak Apple gadget. You can also find out how to use Straight Talk on Non-jailbroken device, in case you running iOS 6.1.3.

You need to turn Wi-Fi on while following each step. Sometimes you have to do the whole thing two times before the result is successful. Users who iPhone mms was not working should deleted messages that failed to be sent before fixing the problem.

Straight Talk MMS Fix for Locked iPhone 4S

While the instruction is mostly meant for unlocked devices, some users reports they have been able to apply the SIM swap method to their AT&T iPhone 4S model locked to the provider and running iOS 6.1.3. There might be a problem with “activation required” pop up after you insert the SIM for T-Mobile. You can fix it by going to Settings – General – Carrier Detect which you should switch off for “auto.”

straight talk iphone mms fix

Straight Talk MMS Fix for iPhone 4 / 3GS Locked Models

Note: You can not edit APN options with Straight Talk card, but My Simple Mobile and T-Mobile SIMs offer you apply changes to these settings, however iPhone 3GS and 4 don’t like these cards that it why you should unlock such handsets from the carrier to use the method described by us.

Step 1. While seeing home screen on the iPhone you need to take the Straight Talk SIM card out to replace it with either My Simple Mobile or T-Mobile SIM. If the card you are using isn’t active you will see No Service status. Don’t worry about it right now.

Step 2. Proceed to Settings, choose General, go to Cellular and select Cellular Data Network. Don’t worry if these settings are blank.

Step 3. Leave the Settings open and take the My Simple Mobile or T-Mobile SIM out. Now insert your Straight Talk card in iPhone once again. You must be quick to go to Cellular – Cellular Data Network, if you are fast enough you will get to your cellular data settings. Do you see them? Wait for approximately 10 seconds while previous settings load. We’ll change them in the next step.

Step 4.  Now, just enter needed info below:

Cellular Data

APN att.mvno

Username (should stay blank)

Password (should stay blank)


APN att.mvno

Username (should stay blank)

Password (should stay blank)

MMSC http://mmsc.cingular.com:80

MMS Proxy

MMS Max Message Size 1048576

MMS UA Prof URL (should stay blank or try http://www.apple.com/mms/uaprof.rdf in case the blank setting has problems)

Another Option: If the settings above don’t work for your iPhone 4S, try to add http://mmsc.cingular.com for the MMSC and for the MMS Proxy.

Internet Tethering (all fields should stay blank).

Step 5.  Return to Main settings and go to Home Screen. Now reboot your iPhone.

Step 6. It’s time to turn off Wi-Fi. Hopefully, the updated mms settings for Straight Talk iPhone running iOS 6.1.3 and lower have fixed the problem.