The Phone Does Not Register To The Networks, Or The Phone Cannot Make A Call - Nokia RM-340 Service Manual

RM-340; RM-341
Baseband Troubleshooting Instructions
Figure 13 Troubleshooting when the "Contact Service" message is seen

The phone does not register to the networks, or the phone cannot make a call

Context
If the phone doesn't register to the network, the fault can be in either BB or RF. Only few signals can be tested
since several signals are 'buried' in one or more of the inner layers of the PWB.
First, check that SIM LOCK is not causing the error by using a Test-SIM card and connect the phone to a tester.
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