are calls to 4445 from US free?

[kir]

are calls to 4445 from S free?

[Bambino]

@kir You can't call short code numbers from the US to the UK. Here are the customer service numbers available. You can download Skype and call the 0800 numbers in the link. Just use the prefix +44800 instead:

Guide: Coronavirus Community Help and Support 

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, or use the Upgrade, Lost/Stolen, or Fraud option to get through. Otherwise you'll just be disconnected.

[Cleoriff]

@kir 

You need to call this number for PAYG whilst abroad

From abroad

+44 7860 980 202

Free†

https://www.o2.co.uk/contactus 

[Bambino]

@kir Just to add to the good advice from @Cleoriff, the number provided is free from an O2 Pay As You Go mobile only. Other providers’ charges may vary.