1. The QQ number entered is incorrect. You can check it again and enter it again to find it.
2. The operation of adding friends on the same day is too frequent, so you can wait until 24 hours before operation.
3. The other party has turned off the function of finding yourself by QQ number in QQ settings. Because your QQ number or your friend's QQ number changed the display account in personal settings. The displayed account can be your or your friend's email address. If you can't find a friend by entering the QQ number in the search, just enter the email address displayed by the other party's QQ in the account column. If you feel troublesome, you can change the display account to your own QQ number, or uncheck the box in front of "Only allow users to find me through the main display account".
4. The QQ number of the other party has been processed or blocked due to violation.
Some numbers are not searchable. There are several main situations here. First, the number has a main display account, which can only be found through the main display account. Second, because of illegal operation, the number was blocked and others could not find it. Third, some numbers that have been recovered or not issued are not allowed to be found by others. This is the case at present.
ICQ is the predecessor of OICQ, and its homonym is i see you, which is an instant chat tool. Oicq is a famous product of Tencent, and icq is the earliest instant messaging software, but it was made abroad. It seems that Israeli-American telephone service companies have the right.
Later, Tencent developed OICQ, a software that is more humanized and more suitable for China citizens, which is also the source of OICQ.
But what I didn't expect was that (at that time), after the software appeared as OICQ, with its clean and clear interface, simple operation, rich peripheral functions and rapid information dissemination (the mainstream chat at that time was realized by mail, and it usually took the other party several hours to receive it), it was deeply welcomed by our people and spread quickly, becoming the first chat tool that everyone knows today.