¿Cómo puedo solucionar “Problema de red celular”?
Mi teléfono no recibe llamada, tampoco se pueden utilizar los datos celulares. ¿Que puedo hacer para solucionar el problema de red celular?
How can I fix “Cellular Network Problem”?
My phone doesn't receive calls, cellular data can't be used either. What can I do to solve the cellular network problem?
See these Apple articles below:
If you see No Service, Searching, or SOS on your iPhone or iPad
If you see No Service, Searching, or SOS on your iPhone or iPad - Apple Support
Manually update your carrier settings on your iPhone or iPad
Manually update your carrier settings on your iPhone or iPad - Apple Support
Update your network provider settings manually on your iPhone or iPad
Update your network provider settings manually on your iPhone or iPad – Apple Support (UK)