I can't use iPhone mobile network of my SIM card

It appears that your iPhone 13 is locked to another cellular service provider. You will have to contact that service provider, to which your iPhone 13 is locked to, and ask that provider on what needs to done to get your iPhone 13 unlocked so that it can work with other cellular service providers.

Axel F.

FYI: These are user-only forums. This is not Apple Support. if you need to contact Apple Support, then contact product and tech support: ➔ Contacting Apple for support and service including international calling numbers. 

Axel F.

hi,

i had used my old phone iPhone 7 which had no network problem issued but after purchased new iPhone 13pro manor problem is income call issue, same network provide card is working in other mobile handset very smoothly. provide me solution about this matter.

one of biggest fault in your new series of iPhone 13 to 13 pro max is network issue bcos other my 15 friends have same issue like me.

if you think that every customer is important for you then reply me as soon as possible bcos i'll not suggested to anyone bcos no one listen in your technical department all are said that talk to your network provider but actual problem is in your handset so take care of it..

if you think i am important for you then reply me or call me