4 sourced reports, with what to check before you buy. Each one links to the page it was reported on.
Costly or dangerous
Green vertical line appears on A15 5G display after a software update
An owner on Samsung's own community reports a green line appearing after the December 2024 update; Samsung's reply directs to a service center for replacement/repair.
What to check. A green line is typically a panel-level defect, not fixable by software; expect a screen replacement cost if it occurs. Check warranty/service-center coverage before paying.
Battery drains too fast and screen stays dark on incoming calls
A verified buyer review on Samsung's Finnish store page reports the battery drains too quickly and the screen does not wake when a call comes in.
What to check. Owners report noticeably fast drain despite the 5000 mAh cell, plus a screen-not-waking quirk on calls. If battery life is a priority, verify the unit's behavior early in the return window.
Coloured vertical lines on the A15 indicate a damaged AMOLED panel needing replacement
A UK repair-parts shop's diagnostic guide states coloured vertical lines on the A15 mean the AMOLED panel is damaged and the whole display assembly must be swapped.
What to check. If a green/pink/white line appears, software fixes won't help; the display assembly must be replaced. Budget for a screen replacement cost if this happens outside warranty.
A buyer review on Samsung's Finnish page describes the phone as slow, laggy, and freezing from first setup, and says other reviewers report the same.
What to check. Multiple EU owners describe sluggishness and input lag even for basic use. If you need a snappy budget phone, this model's performance is a common complaint to weigh.
These reports come from the pages linked under each item: owner forums, repair guides and workshops. They are not a diagnosis of any one unit, and a careful check of the one you are buying still applies.
Text from the Kriko Smartphones catalog, version 0.1.1, under the CC-BY-SA-4.0 license.