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Is your antenna powered? Also do you have an antenna so that it connects to the network? Put your board or module near a window or outside. It will not pickup network if it is indoor.
Do you mean that I cannot use GPS functionality or turn on GPS if the GSM network is not registered? Then it makes sense because it seems to not able to register to GSM network. Both the GSM and GPS have antenna.
After I changed baud rate to fix 9600, the following thing continuously happens.
The problems that still happen: cannot register to network and AT+CGPSPWR=1 got reply "ERROR" with description "operation not allowed".
The module is powered on by 3.7V battery. It is connected to computer using pl2303 USB. It is said that pl2303 USB has 5V.
I suspect this is the source of problem but I do not know how to solve it if it really is the source of problem.
I think that is not a problem. If your module works at 3.7 V then the logic high will be around 2.5 V to 3.7 V. So it will also work with 5 V logic devices.
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