The Mexican government passed a new regulation that requires an ID when signing up for a mobile phone number. I have already encountered issues (January 2,2026) when trying to obtain an eSIM over the internet from Telcel. Getting an eSIM in person at the Telcel office was quick and easy, but they did require an ID. https://www.gob.mx/crt/prensa/la-crt-aprueba-y-emite-los-lineamientos-para-la-identificacion-de-lineas-telefonicas-moviles?