Universal What app/tool can I run on my iPhone 11 constantly to measure 4g lte performence during my road trip ?

[max2]

I will have my phone plugged in the entire time. My only question is can I use my phone at the same time and will the tool still measure the 4g lte performance in the background ?

 

[max2]

I found out nothing like this exists oh well.

 

[C DM]

Might not be quite what you are looking for, but there is Field Test Mode that might be worth looking into (if it hasn't already): https://forums.macrumors.com/threads/ios-14-includes-redesigned-field-test-mode.2247606/