Just as an aside, I tried Smarty and had a great experience with the company but had awful signal. I was gutted as the app, switching process and deal was really good. Especially the inclusive roaming
I had three for a while a few years back so shouldn't have been surprised but this is very location specific.
I would definitely give them a try and if you don't get along with it after a month or so just switch to another. I'm using 1p mobile which uses the EE network and cant reccomend it enough.
You get 25gb for £10 pm and again includes international roaming and tethering.
I'll not pay the extra the big providers want for roaming out of principle and hassle. Robbing b***ds.
Also when you switch, don't forget to go via topcashback etc for a few extra quid