No connection to 5G although available

IoT Modules 5G Module
1

Hello,
I have a Lenovo X1 Carbon Gen 12 with 5G module and have the problem that my iPhone 15 reaches full 5G in the same network and my X1 “only” hangs in the HSPA network, which is of course much slower. My iPhone is right next to it and the same problem in different places. I only had 5G network on my X1 once for a brief moment, what could be the reason?

The software and drivers are up to date. Unfortunately very disappointing at the moment, I hope I can get help.

Network: Movistar
Location: Spain

Thanks in advance for your help.

2

Dear @freezybln
Actually, it is also related with antennas and other conditions.
You can contact with Lenovo and confirm if they have any idea to improve.