***A werid iphone 4 problem....Please help!!!!

so, iphone 4 jailbroke, , i've had use few month already, today. after receive voicemail, problem occurs. problem is, can make call, 1 call can accept call, iphone still showing "calling mobile...", when calling, "doo~doo~doo~" sound disappear. also, if call me, iphone can't receive them, , 1 call redirected voicemail. while calling others, if press end call, call ending.. second normal, iphone show call ending forever
tried once already, restore , jailbreak again, occurs time
try reset setting on iphone, worked!!! after respring or reboot. problem

there way can solve ??

 

don't jailbreak phone?

installed causing problems

 

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