My postpaid also worked for GPRS (exept jawal, you can get it in Jerusalem but i don't plan to use it).
But with 2 cents/KB minimum 60KB, that's not very cheap.
Especially when i know cellcom (and orange IL ?) postpaid data (EDGE/HSDPA) is unlimited.
I thinked since there is MMS, about all operators give data access.
I must find another data solution. And TIM is ending in june