Hey - Sorry for the delayed answer. The Sinotec S7005 7" is a WIFI tablet. It does not have the GSM or CDMA feature necessary for making traditional calls over known service providers' network. It is, however, as said above able to connect to Wifi networks for applications that require data transmissions like Internet browsers, Whatsapp Messenger and so forth. Your ability to make calls from the tablet model (Sinotec s7005) therefore are limited to data calls only. Here is a list of services that would let you make data calls.
- Google Voice
- Kakao Talk
Whatsapp recently introduced a data calling service for way too low rates - it's a beta service currently being tested but it is up and it is running.