The Galaxy A51[1] is a nicely specified handset that should appeal to Samsung fans looking for mid-range performance at a reasonable price. There are more affordable alternatives if you're interested in buying SIM free, though.
My review sample came from Vodafone[2], where it's on contract from £34 a month. It is only available in black from Vodafone, but white, blue and silver versions are available direct from Samsung, where the handset will set you back £329 (inc. VAT) SIM free.
For that money you get 128GB of internal storage, of which 21GB is used out of the box and 107GB is free for your own use. You can augment this via a MicroSD card without sacrificing one of the Galaxy A51's two SIM slots. There is just 4GB of RAM, although 6GB is becoming increasingly common, even at the lower end of the market. The Galaxy A51 runs on Samsung's Exynos 9611[3] processor and turned in respectable Geekbench 5[4] benchmarks, with average scores of 346 (single core) and 1321 (multi core). That's a shade under the benchmarks for the Motorola Moto G8[5], and Google Pixel 4a[6], but perfectly respectable for a handset at this price.
The Galaxy A51's 4000mAh battery kept the handset going for 11 hours and one minute under the PC Mark for Android[7] Work 2.0 battery test, and when asked to play YouTube video for three hours non-stop at full screen, it dropped 20% from a full charge.
In short,