Q：Can Doogee phones or tablets use **carrier SIM cards?
A：Whether a device can use a certain operator's SIM card depends mainly on whether the network frequency band supported by the device is within the frequency band covered by that operator. If it is within the range, it can be used; otherwise, it cannot. However, some operators require that only brand and model devices that have been independently certified by them can access their communication network normally. Devices that have not been independently certified by them may be locked or disabled. If this happens, users can provide the operator with the device's IMEI and other information to request unlocking.
