I have seen so many people asking for a way to send free text to other countries (esp Nepal). I tried this on iPhone. But there are options for other smartphones too. for all i-Devices... go to App Store and download Heywire app. It's free. and you can send text to 140 countries for free...for nepal just dial: +977### ### ####. I think you can use the website too (click here). But it's still in Beta and certain restrictions apply. (It says you can use only on United Telecome (Nepal) but it works on NTC too. I have tried.
Disclaimer: I am not affiliated with this app or website in any way. 
Enjoy.