Both Singtel and Starhub also have free incoming calls but they will also deduct about 50 cents to 70cents everyday regardless u got use it or not.
But now starhub has free 10sms whenever you send out 5sms. but the 10 free sms must be sent out before 2359.
If you send 5 global sms, you will get 10 global sms for free and also must be sent out before 2359