Contact your service provider, there may be an issue with your account that they can resolve at their end.
SOURCE: Samsung U600- WAP and MMS settings for T-Mobile
I have had a similar problem when I first got my unlocked phone. I have T-mobile as well, and once they find out you have a phone device not purchased by them, they are not very helpful - they will give you their default mms settings(same ones listed on their site). I tried those settings and they did not work on the particular unlocked phone I had. I did some extensive web searching and came across a few settings that worked with my phone. I will list them here. Hope they work for you!
*MMS Settings: Home URL - http://216.155.174.84/servlets/mms
*Protocol Type - WAP
*WAP IP Address - 216.155.165.50
*GPRS Access Point - wap.voicestream.com
*GPRS Username - Leave Blank
*GPRS Password - Leave Blank
*Authentication Type - normal
*T Zones - http://wap.myvoicestream.com
SOURCE: Cant send or receive picture messages from Samsung J700 phone
when i try to send pictures on my samsung the picture goes into the out box and give me a message unknown subcriber same happens when i try to retrieve pictures messsages
SOURCE: LG renoir Cant recieve mms
1. From main screen tap the messaging icon at the bottom of the
screen. LG-Renoir info
2. Scroll the screen up and tap Messaging settings.
3. Tap Multimedia Message
4. Scroll down and tap multi msg centre
5. Tap the bottom left icon and tap Add New
6. At Title tap and enter TMobile
7. for MMSC URL enter http://216.155.174.84/servlets/mms
8. than save and activate the profile.. I think this should work. I just did it to mine cause I was having same problem it is now saying its sending so we shall see what happens lol
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