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macrumors 6502a
Original poster
Mar 1, 2012
Does anyones else's APN seem to delete its self every so often? I always have to reenter it.


macrumors newbie
Dec 28, 2012
Does anyones else's APN seem to delete its self every so often? I always have to reenter it.

This has worked for me. My MMS APN used to delete itself as well. I left Cellular Data settings and Internet Tethering settings all blank. Both data and MMS still works for me.

Use this for MMS APN along with all the other usual MMS settings:

The dash is not a typo. Using will work for MMS as well but will delete itself.

Please update this thread if this solves the self deleting problem.

Get on wifi and go to this page with your iphone.

This will not work for MMS APN, only data APN. Apple does not allow carrier settings to set MMS APN.


macrumors member
Jan 18, 2013
I have a i5 on T-Mobile since right before Christmas. I have been using MMS since I got it. I followed the instructions from a youtube video for the settings, I don't remember what I filled in.

The only thing that is filled in is MMSC and MMS UA Prof URL everything else is blank, not sure if it was filled in or not, but I have never had problems with MMS. Does this mean it's fine if those are blank or should they be filled, and if I am receiving pics is it because of wifi, I can't keep track of whether or not the pics I receive are done on wifi or not.

Thanks for any info.


macrumors 68020
Aug 11, 2009


macrumors 6502a
Apr 24, 2012
Denver Colorado
Here they are:

MMS proxy:
MMS Max size: 1048546
UA Prof URL:

Internet tethering

This is what works for me on my iPhone 4S. Keep in mind other phones on T-Mobile may have different settings. My Nexus 4 only has the APN name and MMSC, MCC and MNC fields filled in. Tethering is already enabled on the phone so there is no need for a tethering field in the APN profile.


macrumors 601
Dec 18, 2012
Charlotte, NC
They don't charge for tethering on iPhones. Probably because it's still an unsupported device on their network. I would imagine that if you are in an area that has consistent 3G and burn a lot of data tethering, then they might catch on. When I had a 4S with them I used to tether about 1GB worth of data per month with no issues.
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