Configuration for Libya Wimax Wifi

Dear friends,
I have Tp Link 3G router and wanted to connect my Wimax to use it as a wifi. I have used many devices before with my 3G router like Rifi in Libya and others in another countries. But yesterday when i tried to configure my wimax for 3G router it asked me the following details...

Username... Okay i know
Password... Okay i know
APN.... Optional... if there is than good otherwise no problem
Connecting number.... ???? this is the one i need.. as you remember for most of the devices like rifi the connecting number is #777 but i cannot find one for Libya Wimax. Can anyone help me in this matter?

I hope someone surely is using Libya Wimax as wifi on 3g router..

Awaiting for some positive response...