What do memory cards do for cell phones?
For added data storage - photos, videos, texts, games, download, etc.
Yes, memory cards (referring to SD/micro SD cards) can be transferred between phones. Sim cards (cards which hold contacts and activation data for the phones);however, are not necessarily transferable. Usually Sim cards are locked to a certain phone or phones within a certain network or country. The only way to freely move Sim cards between phones regardless of the carrier or location is by moving it between unlocked phones.
Most modern cell phones run a primitive operating, with a couple exceptions. Most notably the Iphone and any smart phone running Windows CE. Memory is managed by these OS to whatever integrated memory unit the device uses. In most cases this is an internal flash card. Generally the internal cards are small, which is why many phones include an external port for adding SD Mini/Micro cards.
A basic Cell Phone has a limited amount of memory when manufactured. If your phone can take pictures or video it will have some memory but will need more memory to store lots of pictures and long videos. You can add internal and external memory cards depending on the make & model. The basic is a One gig micro card that is inserted internally in most phones. It does not make the phone faster only…