Iphone and 2G vs 3G or 4G tech

Not sure when I have started curiosity in IPHONE. The current market version is 4G, Used versions are 2G and 3G. There are many differences, 2 of them are of interesting to me:

  • 2G in fact it is 2/2.5/2.75G network type: GSM, GPRS, and EDGE, no GPS
  • 3G network type: UMTS  CDMA2000, with built-in GPS price new A$719 (8GB), Iphone 3 and 4 (price A$859  for16GB, A$999 for 32GB)
  • 4G new network type (LTE). not in any smartphone yet
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