Originally Posted by transpac

I use a combination of:

Google Voice
T-Mobile ($3/month)
Talkatone
SecureID Card
Fingerprint
email


For T-Mo, you'll have to enable international roaming. I connect here on AIS/2G for T-Mo purposes, and SMSes are delivered reliably.

You should consider porting some of your current numbers out to T-Mo, GV, etc.

You may have to use a VPN to access your accounts.

Some entities, like CPB.GOV, deliver OTP SMSes to Thai mobiles.