I dont know if you already fixed your problem yet. At least you can make simple phone call using Tmobile on xperia x10.
I have xperia x10, and I have no signal bar. My plan is the monthly Tmobile plan. May I ask what plan of Tmobile do you have that help you to be able to use the phone to say... call someone?
Please help! Thanks,
Diamy: start by going to [settings] then [wirless & Networks] then [mobile networks] the [service providers] then [search networks] this might take a while and once you have a list choose T - Mobile if there is a choice, then choose the 3G network. (X10i does not have 4G.) you should now have a check mark on the network you chose. In the Search Mode on that same page touch the down arrow on the top right and choose [Select atomatically] so you never have to do this again. hit the back arrow at the bottom. Now choose [Access Point Names] if you do not see T-mobile GPRS the hit the bottom left button that looks like a window and select the + New APN. a list should come up and the fallowing should be in the fields to get your phone up and running.
Name= T-Mobile GPRS
Proxy[ nothing goes here]
Port= [ nothing goes here]
Username[ nothing goes here]
Password[ nothing goes here]
Server[ nothing goes here]
MMSC[ nothing goes here]
Authentication type [Choose NONE]
APN type= type in [default,supl ]
good luck, hope it work out for you.
These settings are close but incorrect.
Correct APN, MMS Settings for the Sony Ericcson Xperia x10
Name: Whatever you want
MMS Proxy: 216.155.165.050
MMS Port: 8080
Authenticaation Type: <Not set>
APN type: <Not set>