Problem With GSM Network

[TokeiLampin]

I have two type of hanphone one is NHM-5(3310) one is NAM-1(3610) the two of them have problem with GSM network but DCS there are no problem. The phone of 3310 have problem with to tx if means the phone can get GSM network but cannot make call out i already flash,tools change Directional coupler,GSM TX filter,but the problem still the same.The 3610 phone i already flash and tools the phone with other version type but the problem i get is Sim Card Registration Failed but there are no problem with DCS band sometime when i restart the phone i can get the network of gsm but after that it goes to Sim Card Registration Failed.I already check with netmonitor but no idea what to do if anyone can same problem can u help me to solve this problem

[TokeiLampin]

Is there anyone can solve or have clue what to do