10692901598946200 Why is the number so long and where is it?

Because it is an inter-provincial short message, it needs to be added with an area code, so it is very long.

1069 SMS refers to the third-party platform of non-operating SMS service across provinces or nationwide, which is sent to mobile phones, China Unicom and telecommunications with one number.

Short message, short for SMS, refers to text or digital information sent or received directly by users through mobile phones or other telecommunication terminals. The number of characters that users can send and receive SMS at a time is 160 English or numeric characters or 70 Chinese characters.