Why do sprint phones have a slot for sim cards but dont use them?

[blinkdude_1820]

theres a space under the battery and behind the sticker. can you put a sim card in there?

 

[G'DogMoney]

Its for a micro sd card, not a sim card.

 

[jayjayb]

cuz i think it is like a memery place or idk but u dnt need one..