Where can I find a service for sending free SMS?

Question

Automation

Hello. It is necessary from time to time to monitor the work of the remote program by receiving SMS messages. I used to use the sms.ru service, but now I went to this site and saw a limit of 5 messages per day. Five messages is not enough for me (before there was a limit of 60 messages / day, which was quite enough).
Maybe someone knows a similar service, but with a limit of at least 15-20 messages per day.
Ps. I know about the crutch with Google Calendar, but I would like to find an easier way.

Answer 1

true hardcore, arduino, soldering iron, gsm module.