i use fring
im on 1.1.4
i haven't used the calling option but the chatting with msn and skype works great so...
i cant complain...

__________________
OTB 1.1.2 iPhone
Firmware 1.1.4
Activated/Jailbroken/Unlocked
Calls In/Out: Yes/Yes
SMS In/Out: Yes/Yes
WiFi/Edge: Yes/No
Carrier: T-mobile A

Youtube working...everything working yay