2G/3G/4G

Interesting classifications of 2G/3G/4G…

iDEN
iDEN — 2G

GSM
GPRS — 2.5G
EDGE — 2.75G
UMTS — 3G
HSPA — 3.5G

CDMA
1xRTT — 2.5G
WCDMA — 3G
EVDO 0 — 3G
EVDO A/EVDO B –3.75G

http://opensignalmaps.com/blog/2011/02/18/what-the-2-75g/