Partner and I both on Sky. I try and load an App - no success. My partner does easily

[FrustratedDevon]

My partner and I both on Sky Mobile. She has an iPhone 11, I have an iPhone 15.

Often, using data I try and load an App/use a map/go to a website and either it takes an age or won't load at all. Yet, when my partner tries they load quickly (it happened last night trying to use the RingGo app).

Why such divergence in performance?