Smashed phone on monthly contract - do I replace phone with PAYG and link it to monthly account?

[GreenLeigh]

I have a smashed phone and an outstanding monthly contract. 

I need to replace the phone. Do I buy a PAYG phone and use the existing SIM.

And how do I speak to O2 about it - no way to contact them online or by phone?

Thank you.

[MI5 · Accepted solution]

@GreenLeigh 

Yes, you can put your sim in any O2 or unlocked phone.

O2 phones here https://www.o2.co.uk/shop

or check Amazon for a wider choice of unlocked phones.