Sign up to Smarty using my referral link and get a £10 Amazon or £10 John Lewis voucher. Smarty is powered by the Three mobile network and offers far more competitive sim only deals than the main network providers. They offer no roaming charges in Europe and their network supports 5G. They have a really good app to where you can monitor your usage and add any bolt-ons if you need. Their signal is quite reliable too, compared to others like Lebara or Lyca who do offer good deals but their signal isn't as reliable as Smarty. You don't have anything to lose, give it a try for a month and see how it goes. Smarty will send you a link to the voucher after around 15 days of signing up and then you get to decide if you want to redeem it as a Amazon or John Lewis voucher. So give it a try: