My phone will not connect to internet while not at home or place that I can access internet

For your Internet connection.

• Over Cellular: contact your Carrier (Cellular Service Provider). The agency who issued the SIM to you
• Over WiFI: Contact your ISP (Internet Service Provider), the agency who provided the Internet Service on your Modem/Router to you

However --> Connect iPhone to the Internet - Apple Support

I think something is wrong with the 13 pro max Im having the same issue for the past 2 days & my friend also has Iphone 13 pro max and she also having problems