Excellent work. Congratulations on shipping. If I could find a good Twilio alternative for other countries I might do something similar for another another country.
They have their international beta program: http://www.twilio.com/blog/2012/08/twilio-launches-beta-phon... http://www.twilio.com/international
and this page seems to include a LOT of countries: http://www.twilio.com/voice/pricing
But really, if all you're doing is dialing out, then you don't actually need a local number. Just use whatever service you want (us, Twilio, Plivo, someone else, etc) and set the caller ID to a local number or make the call as a blocked caller ID.