Lg kg 195 sim reading failure

i have lg kg 195 which was working fine untill i i have enabled gprs of ufone now it can not read ufone sim,any knows soloution of this mobile,all sims are working fine only ufone have sim radinfd problem,"un valid sim card" message appread

^ Does that Ufone SIM work in other cellphones? If not then replace your SIM by visiting nearest franchise.

^^ By the way, what you got as your avatar?

Master Reset your phone, it might solve your problem.

yes the sim is working with all cell phones and i h ave also tried other u fone sims but not working