Just make sure that whatever service you end up choosing will re-phone verify your accounts once they get locked. Seems to happen a lot lately especially if you're doing anything remotely automated. Alternatively, you could get SIM cards in your country (they're like $1 where I live) and create them yourself. Not the best solution if you're looking for 1000s of PVAs but it's really good if you only need a handful high quality accounts. You'd still have to create them by hand tho...
