Can someone explain using an esim to me like I'm an idiot please? Going to the USA which isn't covered on my phone contract for data roaming. It's a £7+ charge per day on my phone contract to use my contract data allowance while there but buying an esim seems much cheaper. I'm just not entirely clear what that covers me for.....most are data only so does that mean I wouldn't be able to receive calls or texts on my UK number? Also, can anyone recommend a reputatable company or website to purchase from?