Here's a random Googled up source for that: http://www.kemt.fei.tuke.sk/predmety/KEMT414_AK/_material...
"GPRS encryption is done with a different family of algorithms: GEA0 (none), GEA1 (export), GEA2 (normal strength) and GEA3 (new, and effectively the same as A5/3). Note that the GEA1 and GEA2 algorithms do not have any relationship to the A5/1 and A5/2 algorithms, and they are not publicly known. There are no problems with any of these in the open literature."
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