I have a new Three sim in my phone and have just travelled to Spain through France. Reception in France was never more than H and very slow. Now that I am in Spain it is 4G. My previous sim, a Vodafone, gave good 4G in the six Western European countries that I was in last year so I am very disappointed with my Three sim. I used a Three sim in a MiFi a few years ago and mostly got good reception.