Buenas,
En mi caso tengo el OnePlus Nord, pero parece que comparte los mismos problemas que el 8Pro con la red 5g de Movistar.
Está es la respuesta que acabo de recibir del servicio técnico de OnePlus:
"Thank you for reporting this scenario with us. However, our team of developer's have assessed the scenario and would like to inform you that that there is a future plan but currently no ETA has been provided by Movistar brand (owned by "Telephonica , Spain") as on when 5G services will be made available for your device."
En resumen, muuuucha paciencia