Locked up...

[Sterillium]

I have an iPhone and I'd like to determine whether or not it's locked to O2.

I've put a PAYG SIM in it, and the little bit in the corner where it says O2 3G/4G changed to Vodafone 3G... does this mean it's unlocked? Or would any new SIM cause the name to change, perhaps meaning I need to make a call to find out it it's actually working on a new network?

[essayer]

You can confirm by entering the imei here:
https://imei24.com/

[Sterillium]

essayer said:

You can confirm by entering the imei here:
https://imei24.com/

That's sorcery...

I've followed the instructions and now have a screen full of data... which bit tells me about locked / unlocked?

[essayer]

“Simlock status: Unlocked” should be visible

[Sterillium]

essayer said:

“Simlock status: Unlocked” should be visible

I'm just going round in circles and not seeing anything about a simlock.