I've iPhone 4 cdma (VZW) & trying to switch to another carrier which doesn't have OTA service.

thats what I did to get it work:

step 1: add custom PRL - ok
step 2: convert MEID to ESN- ok
step 3: carrier switched my pESN an gave me IMSI_s -ok
step 4: trying to manually add MSIN+MCC+MNC (IMSI) to my device - deep trouble

P.S. & sorry for PM