@libjep
Settings >Mobile data \and scroll down to your apps.
Move the switch to on for the apps you want to use 4g.
The other possibility is that 4g is oversubscribed in your area, so try it on 3g too.
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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