Why are my calls getting disconnected with a SYSTEM BUSY error message?

[a suser]

SYSTEM BUSY error message

my call is getting disconnected with a message " SYSTEM BUSY" has anybody faced the same problem ??

 

[ven07]

Re: SYSTEM BUSY error message

Did you try soft resetting or removing the sim and inserting it again?

 

[TechFreak1]

Re: SYSTEM BUSY error message

I used to have that issue sporadically when I was with O2 and haven't since I move to three, take that as you will.