You can send SMS directly from your Google Sheets spreadsheet using =SENDSMS or =SCHEDULESMS
The price per country can be found below:

One SMS unit is 124 characters of english alphabet.
If you include non-GSM characters like eastern characters in SMS messages, the size of one message is 39 characters.
If your SMS is bigger than the size limit, you will pay the price corresponding the number of units in your message.

All our prices are in US dollars.

For any question please contact us at support@sheetsms.com