I just managed to read through half of the posts above this and I found a very interesting comparison:

---
16GB + iData 50 (12 mths contract)
Phone = RM2090
iData 50x12= RM600
Total = RM2,690

16GB + Prepaid
Phone = RM2490
Prepaid=RM63
Total = RM2,553

Savings = RM137 = 5% of RM2690!
---
I think many of the forumers reading this thread may have missed out the following point. For the sake of saving RM137/year or RM11.42/month, you have to carry two phones, not going to use your new iPhone for call, sms, and mms for the next 12 months. You new iPhone is only as good as an iPod Touch.