Well, no big blahblah, I come straight to the point.  You will have to set your location to USA when signing up, simply because the number you will provide to FB/gmail will be a US one.

• call (206) 376-1000
• when you have reached the "set up a greeeting message" part wait 2 seconds, then finish it (you need the time to enter the security code later)
• enter the provided number in gmail/facebook
• call your voicemail box after some minutes
• the first time the verification number is announced the first 1-2 numbers are missing, but the 2nd time you will get it

After the verification you can use any kind of IP you like (through Tor for example), after too many IP changes you might have to repeat the procedure, so give your voicemail box a call once a week so the account is not deleted.