Help with Roaming Sim Card

[Anonymous]

Hello,

I just borrowed a friend's O2 phone for my upcoming Europe trip. She bought her phone in Ireland with an Irish Sim card. I am travelling to Switzerland, Madrid, Italy and Greece and I want access in all places. Can I do that with only one
Sim card. Is it best to buy from O2? I see some other providers with roaming Sim cards?

I mainly need for my wife to be able to reach me. She's pregnant and we want to keep close contact.

Thanks all

[Anonymous]

It depends if the phone is unlocked to use any SIM card. Put one in from another operator, if it works you are OK

I have an United Mobile SIM which allows free incoming calls in all the countries you have mentioned. I also keep it in an old mobile of mine in the UK and use it when Rambling as an emergency phone as it will work here on 4 networks.

[Anonymous]

Thanks DaveC,

How much did you pay for your sim card? Can I purchase it outside the UK?

Thanks

[Anonymous]

Yes, you can purchase via the Web to anywhere. https://www.united-mobile.com/

As I said, great if most of your calls are incoming.
The number is based on Jersey Telecom - some operators in the UK see it as a foreign mobile some don't.

[Anonymous]

Thanks Dave C!