Send text messages with foreign mobile phones. Can others know where it was sent?

1. Most people can only find out where your mobile phone number belongs, but they don't know where you called.

2. Unless the public security organ intervenes or goes to the communication company, you can find out where your Qingdao card number is now. For example, if you call Guangzhou from Zhejiang with Qingdao card number, the company can find out and lock your specific location.

The communication company can find out where you were when you turned it off.

As for texting, I'm not sure.