Which screen ends up in your phone?

A service pack is a module the manufacturer supplies for repair purposes; it is identical to what ships in a new device, and the price reflects that. Refurbished means an original panel has been reused and fitted with new glass: the panel is genuine, and the reworking determines quality. Aftermarket or "compatible" is an entirely newly produced module from a third party with its own driver electronics. Within that category the spread is enormous, from excellent to genuinely poor.

The differences show in peak brightness outdoors, in colour reproduction, in how smoothly touch tracks when you type fast, and in how automatic brightness behaves. With weaker modules you more often get a screen protector that will not adhere properly because the edge curvature differs, and sometimes a noticeably thicker panel. On repair day you see little of this; after three months of daily use, considerably more.

Ask which category of part is used and whether you have a choice. Ask how long the warranty runs and whether it still applies if the panel develops lines after two months. Ask whether the repairer tests the new module before fitting. And ask what happens if the sensors do not work afterwards. A repairer who answers those four without hesitating knows what they are doing — with us or anywhere else.