A bit difficult with the limited info we've got but can you try and connect to another wifi hotspot first, somewhere like McDonalds for example so we can determine if it's a fault with your router or your phone first?
Rebooting your rooter can sometimes help and obviously passwords are case sensitive when inputting them.
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
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