Using an old iPhone with international sim?

I'm going to be studying abroad in Ireland from January through May of this year. I just got a new iphone 8 last week and I still have my old iphone 6. I was planning on keeping my iphone 6 so I can use an international sim to get phone calls, data, etc. Since I've already activated my new phone and taken my old phone off the account, will I need to call verizon and have them unlock my old one(iphone 6)?

Yes. It needs to be unlocked to recognise a SIM that's from a different provider.

This is January, you are going to use the old phone basically NOW and yet you took it off the Verizon account? I'm confused

It should be unlocked since it's from Verizon but you should call just to make sure.

Yes it will need unlocking.

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