UK Sim card recommendation.

[onlynik]

Hope someone can help with this.

I'm looking for a sim card for my father's phone.

He spends some time out of the UK and the phone can be off for up to 6 months.

Currently he has an Orange PAYG sim, but it seems to cost a lot for his usage, he's topping up £10 every few days (it's data that's eating it up)

I'd like to keep his UK number and port it to something which gives him some data. He's not a heavy user of calls, but does receive a lot when he is in this country.

I'm thinking about moving him to Giff Gaff, will this still work if the phone is off for 6 months, he doesn't want to lose the number.

Any other suggestions?

[onlynik]

He normally goes away to other countries for long periods, so just uses local sim cards there.

Three does look an option as they seem quite cheap for PAYG. Wonder how often it needs to register on the network. I think he may have been off the Orange network for 7/8 months at one point.

Thanks for everyone's input.