iPhone 2g from 2007

[alantomkins]

I have kept my iPhone 2G from 2007 and it's still fully functional.  It was O2 only at the time so I assume it will not work on other networks, please tell me if I am wrong.   I was wondering if there's still a SIM only tariff that I could to get the phone online for calls only?

Thanks, Alan

[MI5]

@alantomkins 

Yes it will be locked to O2 only and unlikely to work on any other network, however, any of the tariffs sold today would still work for voice calls.

I still have current PAYG sim in my Motorola StarTac from around 1998 ish.