Send text messages to others. Is it possible for others to know the content?

First of all, it is important to see what kind of number you are.

Both mobile GSM and M-Zone have records of calls and short messages in the system. I can't check in the business hall. However, some people in the market do this kind of business, and they can illegally check their number records if they spend more than 1000 yuan.

Unicom is the same, and the post-paid number can be checked.

Therefore, from this point of view, Shenzhouxing is the safest and will not leave any records in the system (as is Unicom's prepaid number).

Secondly, your so-called eavesdropping is technically speaking. This kind of eavesdropping needs immediate eavesdropping, and the technology of cracking GSM network by using tracking channel will only be used in major public security cases.