Listic is correct. We (Twilio) do not support international SMS on accounts by default. We are currently offering it in beta. However, after a quick email to Sandeep just now, I turned it on for his account and you should be able to test International SMS on Phoneify now. Reminder: it is currently in beta, so there may be some deliverability issues in countries that don't have great coverage. Let us know so we can make it better.
For what it's worth it worked amazingly fast for me in Panama. It generally takes around 6 to 10 seconds for the sms to arrive from people a meter from myself. Twilio's sms arrived a two or three seconds after I pressed send.