kopolee11 is talking about a tabelt (7 inches), I am talking about a phone.
The tablet exists in a sim-card enabled version and a wifi-only version. In the latter there is no modem.
In the phone (S3 G4) there is a modem, but perhaps, as telephony doesn't work, this could mean that the modem doesn't function at all. IF that is the case, I suppose it could suit your needs (and my wishes). It should be examined further, though.
