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Root Galaxy not sending SMS

I got a Galaxy S+ (GT-I9001) in Italy. Rooted it and have Gingerbread.xxkqn running on it. Baseband version is I9001XXKPO.

I am back in the states now (Los Angeles) and went with T-Mobile since they use SIM cards.

At first it wouldn't send texts out. Then it did for a long time. Now it has stopped allowing me to send out SMS anymore, for about 10 days now.

I have tried the standard message app, Handcent and GO SMS Pro.

Within maybe 2 seconds of trying to send it comes back as 'Failed'.

I went thru the whole reset process with T-Mobile, cleared messages, reinitialized the phone and am still having the problem.

Any help would REALLY be appreciated, i'm at a loss here and can't afford another phone or better network.

Thanks.
 
Have you reset to default APN settings?

As unlikely as it is, there is also a small chance you have received a new, but faulty SIM card (since it worked then stopped working).
 
hey GTBarry,

thanks for the response.

They did replace the old SIM which was doing the same thing. And now this new SIM has been ok till 10 days ago.

How do i reset APN? Heck, i'd go back to the original OS if that would help.
 
and by the way - when i put my sim into another galaxy, it sends sms fine.

FYI, on my phone, i did pull out the sim, restart phone, then put sim back in, found network, and it let me send out ONE text, then failed on all since then.
 
This is how you do it in ICS+. I can't recall how to do it in Gingerbread. I hope it is similar to this:

Settings > More... > Mobile Networks > Access Point Names > Settings > Reset to default

(First, you can back up what you have now - just in case. Whatever you have selected with the blue dot now as an APN name (you may only have the one there), just open it and at the top, click the name and just add "original" or something like that to the name. Then after you end up creating a new default, you can go back to the original if needed)
 
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