02-10-2012, 01:48 AM
Talking BlackBerry Encyclopedia
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| | Does AT&T's 4G Service Require A 4G SIM Card?
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When I switched devices from 9700 to 9900, I called the geniuses at AT&T via 611 and announced my intention of doing it. The fellow on the other end told me that I can switch the SIM card without any problem, because as long as I have a Blackberry Data Plan along with unlimited internet on my plan, there is essentially no need to do anything.
Just today I decided to update the IMEI number to the system because I thought that it would be necessary to keep it updated if I decided to unlock the phone. I called 611 again and explained this to the fellow on the other end, who updated my IMEI number without any problem, and gave me the unlock code anyway since I have been a good customer with AT&T since back in the mid-90's when I was a customer with Cellular One (then became AT&T Wireless, then Cingular, and now back to AT&T). He said, in passing, that if I am to fully use the 4G capability, he suggested that I switch SIM cards from my previous 9700 SIM card, which is a 3G SIM card, to a 4G SIM card.
Is this true, guys? Even with my old 3G SIM card in there I frequently see "4G" on the top of the screen when I use my browser, but aside from the superior 9900 browser I honestly do not see much of a difference in downloading speed between 4G and 3G, so maybe the 4G SIM card will make a difference? Also, my concern about updating SIM cards is that the 4G SIM card will have issues with my 9700 in case I decide to put it in there and use my old 9700, so is there concern in this case?