n8m sorry for off-topic, All of us here try to help Hanna with her trip.

Hanna, since you've mentioned earlier that you've never bought a micro SD card I'd like to note that not all devices support micro SD (or normal SD) of highest memory capacitance. In general, technical data of a device includes information what is the highest memory capacitance which is supported by this device. Though, frequently devices can support cards with higher capacitance than indicated, but there can be some issues (some SD card vendors can be not supported or some files can be damaged.)

Generally, all devices support SD cards up to 2 Gb.
Many of them support cards up to 8 Gb also.
Cards with capacitance of 16 and 32 Gb should be carefully checked if they can be supported by your device.

A few words about vendors:
SanDisk, Toshiba and Panasonic are the three companies which developed the SD standard in mutual agreement. Their cards are mostly supported by any device.
"Transcend" is one of most popular vendors which available all around the world.