Throttling 5G data

I am a new Cox mobile customer with the Unlimited Plan and a new IPhone 16. I have been testing my 5G data speeds and my results are pathetic, always getting around 25M, and yes the phone is showing 5Guw with full bars. I have tested this at various locations and with actual Version customers also testing on their phones at same time and location and it is always the same, Version phone will get typical 5G download speeds of >400M and I always get around 25M. If I switch the phone to 4G LTE I will get typical 4G speeds of around 200M. Also, I did this day one so I had not gotten anywhere close to the 20G usage limit where throttling will kick in. I worked with Cox customer support over multiple days and their conclusion is that there is nothing wrong on their end and it must be an issue with the phone. I don't buy that, but to cover all my bases I went to Apple store and they ran all the tests they could and conclusion is that the phone is fine. Also, there is a particular Version store that I went to and when physically in that store I do get proper 5Guw data rates ( 400M to 800M) so I know it is not an issue with the phone. My guess is that this particular store has a 5G hot spot in the store which somehow bypasses whatever is causing my issues.

My conclusion is that either Cox or Version must be throttling 5G data rates to around 25M, what else could it be. Has anyone else experienced this in the Phoenix AZ area? What test results are you other cox iphone users getting. If it looks like the rest of you Cox Mobile users are actually getting typical 5G speeds of 200M to 800M then I will accept that it must be my phone and push the issue with Apple but I seriously doubt that will be the case.

It is unacceptable to sign a new 2 year contract and buy a brand new device to finally join the high speed 5G revolution only to to get speeds that are 10x slower than older 4G speeds.

Thanks for any feedback.