My HTC G1 Mobile

[paparazzi]

Please can someone help find solution to my plight. I have an unlocked HTC G1 phone which was prior to this day working in very perfect condition. I realized however, today that I can no longer receive calls on my phone. Callers always hear busy tones at their end while on my call logs I see callers numbers as missed calls. In my own lay man's understanding, i think i have mistakenly pressed on some keys that had just barred the phone from receiving incoming calls. I have tried on my own to see if i could reset this and or solve the problem but no way. Anyone with the right answers to this problwm should please profer. the phone is a HTC google phone G1 from T-Mobile.

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