Does my cell phone need a Memory Card?

I have a Samsung Flight AT&T,and i text alot i also go on the internet,take pictures,and video tape.Just yesterday it's been saying whenever i get a text message..No memory on Sim card.but the thing is i still get the texts but they delay,i get it like 20 min. later after they text me.It's basically going slow.And i'm getting frustrated,it keeps saying that..What do i need to do? I know it's the memory but do i need a memory card? and if so how much do they cost? Thank You!!
Well i also deleted most texts messages i had,i only have about 6 of them,but it is still giving me my messages later..So i'm not sure what else to do.i also delted photos and tones.
Well i also deleted most texts messages i had,i only have about 6 of them,but it is still giving me my messages later..So i'm not sure what else to do.i also deleted photos and tones.
 
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