I usually ask friends what their experience has been in the specific places where I spend time. Network performance can vary considerably between neighborhoods, buildings, and even train routes. I also check whether unused data carries over and whether the plan can be changed easily when my usage increases.

I think it helps to separate general reputation from your own circumstances. Someone who mainly uses Wi-Fi may care about different things than a person who streams music during long commutes. Before switching, I would compare recent experiences, coverage information, pricing, roaming conditions, and plan limitations rather than relying on one opinion. For example, browsing Lycamobile reviews https://lycamobile.pissedconsumer.com/review.html could be one source alongside other independent information when making a comparison.