I have problems using the internet connection on my Samsung Galaxy S21
If you can't use your phone's internet connection, there may be several causes of the problem.

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Check out nowIf you can't use your phone's internet connection, there may be several causes of the problem.
Slide two fingers downwards starting from the top of the screen.
Press the settings icon.
Press Connections.
Press Mobile networks.
Press Access Point Names.
Press the required SIM.
Press Add.
Press Name.
Key in O2 UK Internet and press OK.
Press APN.
Key in mobile.o2.co.uk and press OK.
Press Username.
Key in o2 and press OK.
Press Password.
Key in p and press OK.
Press MCC.
Key in 234 and press OK.
Press MNC.
Key in 10 and press OK.
Press Authentication type.
Press PAP.
Press APN type.
Key in default and press OK.
Press the menu icon.
Press Save.
Press the field next to the data connection to activate it.
Press the Home key to return to the home screen.
Slide two fingers downwards starting from the top of the screen.
Press the mobile data icon to turn the function on or off.
Press the Home key to return to the home screen.
Slide two fingers downwards starting from the top of the screen.
Press the settings icon.
Press Connections.
Press Mobile networks.
Press the indicator next to 'Data roaming ‹SIM›' to turn the function on or off.
Press the Home key to return to the home screen.
Press the Side key.
Simultaneously, press and hold the lower part of the Volume key and keep them both pressed until your phone restarts.