I've been looking at Twilio on and off for more than an year and would really like to make use of it and do something interesting. But they're still mostly US-centric that makes it kinda difficult for anyone not targeting a US market to use efficiently (I don't blame them - I'm sure the paperwork itself to run something like this in each country must be a nightmare)
We just added full support for SMS in Canada[0], have local voice-enabled numbers in the UK, many more European countries on the way[1] and international SMS in beta[2]. If we're not where you need us, most likely we're working hard to be there as soon as it's possible.
If you have a phone number you want to use to make calls from in a country we don't offer local numbers, you can verify it to use as a caller ID then call to any of our supported countries[3].
Thanks. For what it's worth, I'm in India - I know the bureaucracy around here will make it tedious - but on the other hand, everyone has a mobile phone and sms is very popular (and cheap) - the market for phone-based apps is potentially very huge.
We haven't announced any formal plans for expansion to Asia, but we are committed to serving developers worldwide. We'll make sure to let everyone know when we have plans we can share.
Checkout Tropo (https://www.tropo.com/) which is basically the same, except your application logic can be hosted on their servers if you want. It is by Voxeo so uses their existing network for international calls and SMS.
There is also Plivo (http://www.plivo.org) which is an open source implementation, except setting it up is far from trivial in my experience :)
