How can a computer send text messages to a mobile phone without spending money?

The only one that doesn't cost money is China Mobile's Fetion. This shortcoming is that you have to add the other person as a friend, and you can send a message to the other person only after the other person agrees. In fact, it is too difficult to be completely free. Third-party professional SMS senders can be considered. Software is provided free of charge, installed on its computer, and then recharged. If you only receive 10 yuan, there will be hundreds of short messages to send, which will only take 4 or 5 minutes. It won't cost much. Our restaurant uses my MMS network to promote new dishes. You can also search your local company for reference only.