The best replacement for iphone 4g is htc evo.

The best alternatives to iphone 4g are rated as following:
★★★★★  htc evo
★★★★  3gs
★★★★  droid
★★★  droid incredible
★★★  samsung galaxy s2
★★★  iphone 3g
★★  mytouch 4g
★★  iphone 5
★★  iphone 3gs
★★  evo 4g
★  htc incredible
★  evo
★  htc evo 4g
★  nokia n8
★  iphone 4
  samsung galaxy s
  samsung galaxy

Your alternative for iphone 4g is not listed? Suggest!
Speaking about iphone 4g, one probably shouldn't forget about verizon.

Other search terms related to iphone 4g and their ratings are:

★★★★★ verizon
You have in mind a companion for iphone 4g and it is not yet here? Propose!

Google Trends

Scale is based on the average worldwide traffic of iphone 4g in all years. Click on graph for more.
iphone 4g
htc evo