unable to see callers name topic

I have got s5 G900p from ebay to use cmda sim (reliance network) Its a unlock phone. Everything is working fine but I'm facing an issue with incoming call. I'm unable to see callers name :( somtimes its shows name and later again it will dispaly only number with location. For ex i stay in delhi. It show New delhi (on place of caller name) and number of caller. So kindly please help me with this problem. I have also used secondary option of LARGE SCREEN CALLER ID. But i dont want to use and secondary apps for caller. sometimes my phone get struck with caller id app. Rightnow my phone running with kitkat. Thanks in advance :)