iMessage activation
Why does every time I try to activate my iMessage and inputed my Apple ID and password, it always came to an end saying an error occurred during FaceTime activation?
Did you look at the first link I posted?
Some things you can try. Do you have access to another WiFi network where you can try? That has worked for several people.
Try a restart.
Restart your iPhone, iPad, or iPod touch
Try a forced restart.
If necessary
Hard reset.
Do a backup and try a factory reset. Then restore from your backup.
Restore - If you see an error when you update or restore your iPhone, iPad, or iPod
Backup - Restore your device from an iCloud or iTunes backup.