Four weeks in Italy, France, Switzerland, Ireland — 3 UK SIM best?

Flyertalk points out these two articles https://jmcomms.com/2015/11/02/sort-it-out-three-using-data-abroad-feels-nothing-like-at-home/ https://jmcomms.com/2015/11/05/three-admits-it-slows-data-for-roamers-so-where-do-we-go-from-here/ which points out Three UK throttling very heavily when abroad:

On a short trip to Germany last week, I forgot to install the British Airways app to check in for my flight home. The app isn’t massive (it’s around 24MB), but it took the best part of 10 minutes to download.

Three sort of acknowledges:

We have put a number of steps in place to ensure the majority of customers are able to fully enjoy the most popular services when on holiday abroad on their handset like Facebook, Instagram, Google Maps and web browsing. Hopefully that clears things up.

So that 12GB? That's sort of pointless. I will try to put on pretty red socks and see whether they throttle that and report back in September.

If you are looking for a roaming data service without any explicit speed constraints a good value is a Google Project Fi SIM, which charges a flat US$10/GB for data everywhere it works, on LTE/4G where available. The drawback is you need someone in the US willing to acquire it for you, but if you have that the roaming data service is quite good.

I use Three in Europe because its service includes voice minutes and I use them. For data Project Fi is better.