ASK: My router get WAN IP, but PC can’t access internet.

Answer: 

1) Check the DNS, you can make a ping to a normal IP (e.g. 8.8.8.8), if ping IP is ok, the question must be caused by DNS.

2) Make sure the SIM card support data service, you can try it in your cell phone.

3) Signal is too weak. Move antenna or change position to get better signal.