HT201471: Identify your iPad model
Learn about Identify your iPad model
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Mar 9, 2013 12:55 PM in response to mody osamaby rccharles,AT&T model iPad uses the GSM protocol and has a mini-sim card slot. GSM is the most widely used protocol.
Here are the converage maps:
For GSM: http://www.worldtimezone.com/gsm.html
( Most people recommend GSM for the widest world wide coverage. )
The other main protocol is CDMA.
For CDMA: http://www.cdg.org/worldwide/index.asp
( The coverage map is optimistic. One company with one cell tower means that the country has coverage. )