WiFi issues

[Salma5]

I am having problems with my WiFi wouldn’t connect anywhere until I did a re-set but now WiFi  is really slow 

[Enlli]

Assume you mean mobile data and not WiFi (that's from your home broadband and nothing to do with O2)

Guide: How can I sort out my network issues? 

Guide: Is the network down for me or everyone? 

Also download and use to track and report network faults 

https://www.o2.co.uk/apps/my-network

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[japitts]

WiFi is a connection between a mobile device & broadband router.

Mobile data uses the mobile network to provide an internet connection.

Which do you have problems with?