Here’s The Fix if You Cannot Send Out SMS on iPhone 4S, 4 or 3GS

First of all, you need to check your SMS center number to make sure that it’s correct. You can check by typing the following and press Call:

*#5005*7672#

You will then get the message as shown below:

Setting Interrogation Succeeded
Service Center Address
+8613800100500



To Add T-Mobile Service center for Messaging:
(iphone 4/4s)

**5005*7672*+12063130004#

T-Mobile Center: +12063130004

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Name:t-mobile US
APN:epc.tmobile.com
Proxy:216.165.155.050
Prot:8080
Username:<not Set>
Password:<not set>
Server:wap.voicestream.com
MMsc:http://mms.msg.eng.t-mobile.com/mms/wapenc
MMs proxy:216.165.155.050
MMs Port:8080
MMs protocol: Wap 2.0
MCC:310
MNC:260
Authentication:NONE (Make sure you dont leave blank put NONE)
APN type:<not set>

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