Service to receive Facebook verification sms longterm?

Can anyone recommend a service which provides real/virtual phones for US numbers that work with Facebook verification?

Am using one which works for all other social networks but doesn't receive FB sms.

For someone outside of the US but using a US number, so Google Voice etc isn't possible for me.

Try number of other country. Whats problem?

After trying alot of different pva providers so far none have been usable for Fb verification apart from pvaverify advertised here but they're not longterm numbers. Can anyone advise on whether that would be a problem. ie. if you verifiy fb with one number if they ask to to reverify later can you use a different number?