The problem mi ght be from the network IC on the board,the tips below will be helpful; 1. You have to observe the handset if it has to do with setting the network band for the appropriate subscriber required of the phone. 2. If it is phone that has up to three network band you select them one after the other to get the appropriate band for the subscriber, you them register it. 3. Checks if the antenna is touching the board interface, if do so. 4. Take a close look if anything is removed or pull off from the network area board e.g. chips, capacitors, IC diode etc. 5. Check if any resistor or chips are not soldering very well then you solder them. 6. If not still, you service the board by washing and heating 7. But you must ensure the board is cool before you must couple it. 8. If no still network you can rewrite the PM by means of software.
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The problem mi ght be from the network IC on the board,the tips below will be helpful;
1. You have to observe the handset if it has to do with setting the network band for the appropriate subscriber required of the phone.
2. If it is phone that has up to three network band you select them one after the other to get the appropriate band for the subscriber, you them register it.
3. Checks if the antenna is touching the board interface, if do so.
4. Take a close look if anything is removed or pull off from the network area board e.g. chips, capacitors, IC diode etc.
5. Check if any resistor or chips are not soldering very well then you solder them.
6. If not still, you service the board by washing and heating
7. But you must ensure the board is cool before you must couple it.
8. If no still network you can rewrite the PM by means of software.