My girlfriend and I use an icloud account of iphone6. She can receive any message I send. What function is this?

You can turn it off. 1, SMS synchronization appears on iPhone, mainly because two mobile phones use the same iCloud account, and both mobile phones have enabled iCloud SMS synchronization function.

2.iCloud has synchronization function. As long as the mobile phone turns on the iCloud cloud synchronization function, it will first synchronize the mobile phone to the iCloud cloud, and then download it to the same iCloud account on other Apple devices through the iCloud cloud.

3, so go to phone settings -I cloud- address book to close.

4. Or directly change the I cloud account, just like setting -iCloud- delete account, and then log in with other iCloud accounts, so that there will be no SMS synchronization of different accounts.