Which memory card is compatible for Lumia 720 ?
microSD card up to 64GB
microSD card, that is, class 4 or higher.
Nokia Lumia 720 - What types of memory cards can I use with my Lumia phone?.
fast 4-32GB microSD card from a well-known manufacturer. Capacities of up to 64GB are supported. Some cards are currently incompatible with the Lumia phone. Smaller capacities than 4GB are not supported. formatted with FAT32 (4-32GB cards, 32 KB allocation unit size) or exFAT (64GB cards, 128KB allocation unit size)