This is a great item for to get data and use for internet. This tablet can not be used a phone unless you are AT&T user.
This Tablet is AT&T Unlocked. Fully Compatible with AT&T. Other GSM Providers need to check with the network provider for compatibility of the device.
Phone feature does not work for any carrier but AT&T customer. Customer need to change the APN setting with thier carrier. Does not work with CDMA Carriers like Verizon or Sprint.
based on the carrier