I have followed the instructions set forth here: http://support.t-mobile.com/docs/DOC-2383# to configure propoer APN and MMS settings on my iPhone 4.
I have been an iPhone user on T-Mobile for about 4 years, begrudgingly using the EDGE network the whole time.
I was happy to FINALLY get something faster than EDGE on my iPhone so I could stop relying on my 4G hotspot to accomplish anything on it, but have noticed that occasionally my iPhone will switch from fast.t-mobile.com to epc.tmobile.com.
I know this because I will notice that I am in an area normally giving me 3G speeds, but by phone reflects EDGE. I then go into Settings -> General -> Cellular -> Cellular Data Network -> and APN and MMS will say epc.t-mobile.com.
Why would it just switch on its own??
I believe fast.t-mobile.com is designed for LTE devices, and epc.t-mobile.com is for devices using the HSPA+ (4G) networks.
You can see this noted in the doc for APNs on Android, but since iOS reassigned the correct APN they probably did not feel they needed to explain it in DOC-2383 you were reading. Really, they are both correct and nothing to worry about. If your device can obtain a data connection, the APN is ok.
Thanks for the response. When I am epc.t-mobile.com I get the EDGE network, which when I run a speedtest, gives me 4-12Kbps, whereas the fast.t-mobile.com gives me 3G and I get 6-10Mbps, so it definitely makes a difference.
Just don't know why it keeps switching settings when I manually assign them...
Oh, yes I see what you mean. I'm not sure why it would remove fast.t-mobile.com and kick you onto the EDGE network. I will forward your post over to somebody who can help look at your account and other details. They should be reaching out to you.
Is there an update on the solution for this? I am curious.
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