Permanent number

I pay about $100 a year for a permanent email address (OK, I receive some interesting magazines too for this price). What would I pay for a permanent phone number? Which country would it be in? How would I receive calls in a reliable manner (without paying 1$/min for international call-forwarding to my mobile phone, or hurrying from WiFi spot to WiFi spot with my laptop running)?

How about international roaming flat-rate always-on dollar-a-day data connectivity for my phone?