Widespread GPS Issues Across Multiple Devices and Environments - Need Help!

We're experiencing persistent GPS problems that have been ongoing for several months now. 

Affected devices: Both new iPhones and Samsung phones
Environments: Major urban centers and rural areas
Weather conditions: Occurring in both sunny and rainy weather
Duration: Several months of consistent issues
Troubleshooting: We've already performed all standard troubleshooting steps
Despite our efforts, the problem persists across all scenarios. We're at a loss and could really use some expert advice or insights from others who may have encountered similar issues.

Questions for the community:

Has anyone experienced similar widespread GPS problems?
Are there any known systemic issues affecting GPS across multiple device types and carriers?
Can anyone suggest advanced troubleshooting steps or diagnostic tools we haven't considered?
Has anyone found a solution to comparable GPS problems?
Any help or direction would be greatly appreciated. We rely heavily on GPS functionality, and these ongoing issues are significantly impacting our daily operations.

Thank you in advance for your assistance!