This 256GB microSDXC memory card is compatible with the 2017 Samsung Galaxy A3, which supports up to 256GB of external memory in microSD, microSDHC and microSDXC formats. So it can be used to expand the storage capacity of this model with no problem.

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Samsung Electronics GmbH Hello, Thank you for your enquiry. The Samsung PRO Plus microSD memory card (2023) incl. SD adapter - 256 GB MB-MD256SA/EU offers you a memory expansion of 256 GB. Please check whether your Raspberry Pi 5 has a suitable microSD or SD slot and whether it allows a corresponding memory expansion. If in doubt, please contact the device manufacturer. Best regards from Schwalbach Your Samsung Service Team

TL;DR: Yes. But perhaps you need to reformat it. Long story: - if the phone says it is compatible with microSDXC: it should work as is. Samsung simply didn't officially certify more than 256GiB, because larger cards didn't exist back then. There is no technical reason why larger cards (up to 2TB) could not work. - if the phone says it is compatible with microSDHC up to 32GiB: You will need to reformat. There is no hardware difference between microSDHC and microSDXC, the difference is software: out of the box, microSDHC come pre-formated as FAT32, and microSDXC come pre-formated as exFAT. If you phone is microSDHC, it doesn't have the driver to read exFAT partition, you will need to reformat the card into something that the phone can read (on older Androids that would be FAT32, ext4 or f2fs): https://support.google.com/android/answer/12153449