Struggle to get 5G on iPhone 14

[Scott1204]

I only get 3G - 4G data and my partner gets 5G while we are both on the same sky network only difference is she has an iPhone 15 and I have a iPhone 14. I have enabled all my settings in the sky app and on my phone to allow 5G but I rarely ever get it which is annoying when my partner gets it basically everywhere we go meaning it can't be the area we are in. Any help would be appreciated.