I always thought Wap was slow internet (dialup) while GPRS was fast (broadband) internet for phones....
Wap is carrier independant:
first you had CSD (Circuit Switched date': 9.6 kbps
Then you've got GPRS (General Packet Radio Service): 177.2 kbps theoretical, 35 kbps actual.
And the next generation is UMTS (Universal Mobile Telephony System): up to 2 Mbps.
WAP itself remains, but the version changes to accomodate for the new carrier-speeds.