Moving to holland with an iphone phone

Moving to holland with an iphone phone help?!

I currently live in the UK and am trying to work out how to move to holland whilst keeping my iphone 4. I would still need a phone with access to 3G in both countries and it seems in order to have this I would have to get two separate phones as no providers can offer 3g in both countries. Does anyone know if I buy an iphone 5s in the uk if it will work with a dutch sim (as i'm completely clueless on these things) I would prefer to buy my iphone 5s here as I can get it cheaper. Alternatively would it be better to just do it all in Holland?

I don't understand the problem. Cancel your current plan, and get a new sim card and plan in Holland.