You have to dial the exit code for your cell phone network. I’m not sure about that software you’re using so not sure what exit code you will have to put on it.
But normally for Israel, you have to dial International Exit Code and it is different for each Israel carrier: 00 (Kod Gisha), 012 (Smile Tikshoret), 013 (NetVision), 014 (Bezeq), 018 (Xfone).
After the International Code, dial, 44 and then the cell phone number starting with 7. You have to drop the first and leading 0 in the start of the number.