i should wait till July 2011 for the new release, its not good to spend QR 3250 right now for the faulty device i4 as i am already having a old iPhone.
my cousin bought i4 2 weeks back in UK, i spoke to him also about signal problem. He confirmed also that even upgrading to 4.1 OS still there is reception problem if u are using it without case.
people are too crazy for i4, i am also too attracted to this phone. but real fact is that problem is there, and its not worth QR 3250