GPRS終端必須支援GEA2，GEA3和GEA0（不加密）演算法，GEA4是新引入的128 bit加密演算法，正在推廣期；而GEA1是將要被淘汰的加密演算法，在Release 11終端被警告使用，Release及之後將被禁止使用
Sophia Antipolis, France, 21-25 January 2013
In light of the attacks against the GEA1 GPRS encryption algorithm it is clear that the algorithm no longer offers the same level of protection as GEA2, (which in turn is not as strong as GEA3). Therefore it shall not be supported in mobile stations from
Warning regarding the removal of GEA1 from the list of ciphering algorithms that the ME is allowed to implement, from Release 12.
Operators and implementers would not anticipate the changes regarding the use of GEA1.
3GPP 43.020 Annex D
It is mandatory for GEA2, GEA3 and nonencrypted mode (i.e. GEA0) to be implemented in mobile stations. GEA1 and GEA4 may be implemented in the mobile stations.
NOTE: As mobile stations are not allowed to implement GEA1 from Release 12 onwards, it is strongly discouraged to support GEA1 in Release 11 MS.
No other GPRS encryption algorithms shallbe supported in mobile stations.