Adding friends on QQ, but I don't know if there is any problem with adding friends by SMS, and it is less passed.

At present, due to malicious websites using the function of adding friends, they send a large number of invitations to add friends and illegal advertisements to QQ users at will, which has caused serious harassment to some QQ users. Tencent has temporarily made the following restrictions on adding friends to QQ:

1, each QQ number can send up to 50 invitations to add friends a day.

2. For suspected malicious IP, an IP can send up to 500 invitations to add friends a day. Once it exceeds 500, the system will automatically restrict some IP's conditional, selective and long-term sending of friend invitation. Note: You can add up to 500 friends (including strangers and blacklists) and up to 50 groups.