You live in a roaming area, and thus won't be able to set it up with your current address. Your options are as such:
1. Find someone who is willing to let you use their address that lives within AT&T coverage. However, AT&T's terms dictate that at least 60% of your minutes must NOT be roaming, so you'd have to be sure to satisfy that each month. Otherwise, they'll terminate your contract (happened to me.)
2. Figure out who operates the towers that AT&T is leasing for roaming in your area. Sign up with them, and hack your iPhone.
3. Move.