Last updated: August 2026
The A51 was one of the best-selling Android phones in the world in its year. Enormous numbers were sold in South Africa, which means plenty are still circulating on the second-hand market — and that is exactly what to be careful about.
Why a popular old phone needs more scrutiny, not less
High sales volume means high supply years later. It also means:
- More devices with heavily degraded batteries, since they have been in use for years
- More stolen handsets in circulation — check blacklist status before buying
- More sellers assuming it is still a safe buy because it was once excellent
Popularity in 2020 is not a recommendation in 2026.
The checks that matter
| Check | How |
|---|---|
| Security update status | Confirm before buying — likely ended |
| Battery health | Visible in settings or a diagnostic app |
| Blacklist status | Stolen devices are blocked on SA networks |
| Screen burn-in | AMOLED panels can show it after years |
That last one is specific to older AMOLED phones and easy to miss in a quick look — check a plain white screen.
If you already own one
Keep using it if it works. Move banking apps off it if updates have stopped, and consider a battery replacement — inexpensive, and it restores most of the original endurance.
Pair it with a SIM-only plan for the cheapest possible running cost.
See Galaxy A50, Galaxy A52, Galaxy A35, pre-owned contract deals and budget Android deals.
Frequently asked questions
Was the A51 good?
Very — one of the best-selling Android phones of its year.
Should I buy a used one?
Only after checking battery health, blacklist status and update support.
What is screen burn-in?
Faint permanent marks on older AMOLED panels. Check against a white screen.
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Support positions change. Confirm current status before buying. This is general information, not financial advice.