I am traveling to Spain in September and will be there for 45 days, starting in Madrid. I would like to know where to get a SIM card for my iPhoneXR and what company and plans might make sense for me. My carrier, T-Mobile, tells me my phone is already unlocked.
I especially want to be able to use the phone for navigation and translation. I will make very occasional voice calls. I assume that I can also make WhatsApp calls using my phone and computer, preferably with WiFi.