Galaxy Nexus devices purchased on Google Play are unlocked GSM/HSPA+ devices.
The unlocked Galaxy Nexus requires GSM compatible service provider for voice calling. In the United States this includes AT&T and T-Mobile. Phones purchased from devices on Google Play are not compatible with Verizon or Sprint.
High speed data access requires a compatible 3G/4G HSPA+ cellular data service provider such as AT&T and T-Mobile.
If you have trouble connecting to your carriers mobile data network, contact your service provider.