I have been using my mobile phone for 3 weeks now. Suddenly, when I am "text-ing" it said it is unable to send the message. How come? I am not changing my settings. I am a Globe Prepaid user, by the way, and I still have credits/load. It is also unable to send to 222. However, I can receive messages. I tried using my sim card in another phone and it is capable of sending sms.