Bill

[Lisawill123]

I can't make a phone call

[Bambino]

@Lisawill123 This is a customer community. There's no way for anyone here to know why you can't make calls.

Download Skype: Guide: A Guide to Skype 

Call customer service for free on +44800 902 0217 (Payment Management) or +44800 032 1402
When it comes to the reason you are calling, stay silent for 15 seconds and you will be taken to the keypad options.
Press 2 for Everything Else
Press 5 for More Options
Press 7 for Anything Else which will put you though to someone.
Say 'Upgrade', 'Lost/Stolen', or 'Fraud' if the suggestion above doesn't get you through.
Best time to call is 8 am.
You can also reach O2 via social media:
Facebook (https://o2uk.co/O2CFB), Twitter (now X) (https://o2uk.co/O2CTW), or Instagram (https://o2uk.co/O2CIG)

[pgn]

Could be a number of issues, @Lisawill123 - Guide: How can I sort out my network issues? may help, otherwise you will have to contact O2 from another phone or mobile to the 2nd number in the list below, or use Social Media via the link at the foot of this message. Good luck!

Customer Service Numbers:

From your O2 mobile	202	Free
From a landline	0344 809 0202	Standard UK rate
From abroad	+44 7860 980 202	Free†

Opening times

Monday - Friday	8am - 9pm
Saturday	8am - 8pm
Sunday	8am - 6pm

[jonsie]

Clean the sim card with a soft cloth

Reboot the phone

Are your payments up to date?