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Please note that if you have two SIM cards inserted in your OnePlus 2, OnePlus X, OnePlus 3/3T or OnePlus 5 device, only one SIM will connect to a 3G/4G network.
The other SIM card will only be able to make phone calls and send and receive text messages. If the SIM card cannot be detected, please try switching the SIM card from SIM slot 1 to SIM slot 2. Please configure the APN setting with your network provider or try a different SIM card if possible.