Have you face "Unable To Send Text Until Service Is Available"? I just sent sms out after a few days try and error and search a lot of forum to find out the solution, but no one can directly solve the problem. I also not sure what I did untill can send out. Anyway hope these can help u:
1) My signal is good. I can send sms out (I test with sms to myself) by stock messaging but cannot with Handcent. Both can receive sms.
2) I reg with Handcent, and update, still cannot send.
3) I open WiFi, still cannot send.
2) I disable stock messaging notification and enable Handcent notification, still cannot send.
3) I install GO SMS and chompSMS, also face same problem.
3) I uninstall all sms apps (included GO SMS, chompSMS) and install back Handcent only, still cannot send.
4) I delete all sms (after backup to gmail) since i get this solution from other forum, still cannot send.
5) I restart my phone, still cannot send.
6) I off Wifi and open Data Connection, suddenly can send.
7) I off data connection again, still can send.
8) I on Wifi back with data off & on, still can send.
9) I suspect Data Connection, but curious why i off data connection and wifi again, still can send. Normal sms should be send out with signal good, but why i need to on and off to play around then only can send???
10) I install back GO SMS, chompSMS. Now all can send.