victor2020thank for the reply victor,
Hi there, kindly follow the below steps:
1 . Kindly use another sim in the device and see if it works.
2 . Use the sim in another device and see if the issue is with sim.
3 . If the issue persists with device using another sim, kindly factory reset your phone after taking a full backup : https://www.asus.com/support/FAQ/1006346/
4 . Last option would be to visit the service centre to have a
check. Locate here: https://www.asus.com/in/support/Service-Center/India