Does Gizmo Work with Tmobile?

Is the GizmoWatch compatible with T-Mobile? No, the GizmoWatch by Verizon is not compatible with T-Mobile. Does T-Mobile support the VTech Kidizoom Smartwatch DX2? No, the VTech Kidizoom Smartwatch DX2 is not supported by T-Mobile.

Is gizmo only for Verizon?

Unlikely. This one Gizmo is for Verizon's proprietary CDMA network. AT&T uses GSM. By the way, this old Gizmo2 is obsolete, Verizon won't even let you connect it; got to use the new GizmoPal3 watch.

Does the GizmoWatch work with AT&T?

Verizon LG Gizmo Watch

It has excellent 4G LTE coverage and has an appealing design. The connecting app can be supported by an AT&T phone, so you can pair that with the watch (for which you will need a $10/month Verizon plan, which is the same price you'd pay at AT&T).