MY CHINESE IPHONE SAY INSSUFICIENT MEMORE?

I SPEND $200 BUYING 2 CHINESE IPHONE AND 2 SAMSUNG GALAXY AND 1 BLACKBERRY. I RECEIVED THE PHONE AND I PURCHASE SD CARD AND INSTALL IN THEM BUT THE PHONE KEEP SAYING INSUFFICIENT MEMORY. I TRIED All SIZE OF MEMORY CARD BUT IT STILL SAY INSUFFICIENT MEMORY I EVEN DELETE SOME STUFF.

Its fine