I need help obtaining a static IP address for my SIM card

I am currently experiencing a problem with my SIM card, supplied by KPN, which is unable to obtain a static IP address in a stable manner. Despite several attempts to configure it, the problem persists and this is affecting the connectivity of the device. Here's what I've tried so far: Manually configuring the IP address settings in the device settings. Exploring the use of APM (Application Performance Monitoring), with no success in obtaining a stable static IP address. At present, I'm continuing to run tests, but the kit is no longer able to connect to the Internet. Have you encountered a similar problem or do you have any advice on how to resolve this? Any help or suggestions would be greatly appreciated. Thank you in advance for your help.