Purchased new phone - will old number and sim still work?

[tpgrok]

Hi,

I had a Virgin Media account now O2 - monthly payment direct debit. Got 3 phones on the account - separate users. I've always purchased handsets through Virgin in the past but have bought a phone (Samsung S23 ultra) independently as I got a better deal elsewhere.

My loans for the existing phones are all clear. My question is, once I activate the new phone, will it keep the old number and will I be able to swap the SIM card into it without problem. the old phone was also a Samsung (S10+). Thanks in advance for any help.

[MI5 · Accepted solution]

@tpgrok 

Just put the sim in the phone and it will work fine.