Can you provide more details including;
- what phone is it/are they
- this is your home Wi-Fi - Virgin Hub?
- do the handsets see other Wi-Fi networks?
- do other devices connect to the home Wi-Fi?
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I know a bit about Wi-Fi, Telecoms, and TV as I used to do it for a living but I'm not perfect so don't beat me up... If you make things you make mistakes!