How to contact foreigners?

You can send international short messages with GSM mobile phone, and you don't need to open it. Open by default, one yuan each.

Some time ago, my mobile phone received a message from a Japanese friend. I received it on my mobile phone. I don't know if she sent it from her mobile phone or from her computer. Both sides are free.

Then if South American countries also have this business, it can help you keep in good contact with your friends and save money.