I had the "call failed" problem 2x already. I had to re-jailbreak in order to make it work. Anyway, today I found out this problem actually can easily overcome by going to setting > phone > show my caller ID > ON . I also found another tip says make sure setting > general > date&time : time zone set correctly. I hope this help. .


Iphone : 16GB
Firmware 1.1.4
Service provider : DiGi ( Always the smarter choice . . meh ? )