Memory card doesnt stay in my blackjack!!!

you can unlock your sd card by formatting*.
formatting memory card will delete all datas

formatting method*

use a softtwaer phone for formatting.. (example nokia 6120c, 5800etc )
insert your sd card into the softwaer phone.. select SETTINGS > DATA MGR > MEMORY > OPTIONS > FORMAT MEMORY CARD

It sounds like in your situation that you may have a bad card. If you cannot get your card to mount to your phone for storage, I would try to find access to a pc that has an SD card slot that you can try to format it that way. If the card still wont format, your looking at a defective card and will need to purchase a new one.

You can find Micro SD cards here for purchase.

http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&Depa=0&Order=BESTMATCH&Description=micro%20sd&IsRelated=1&cm_sp=KeywordRelated-_-micro_sd_card-_-micro%20sd

it should work fine. maybe the memory card is faulty.
have you tried the card in anything else to check that it works properly?

If you have no SD slot on your laptop, you will have to buy an external USB SD reader. They typically cost $5-$10, and are readily available online (e.g. http://www.buy.com/prod/micro-sd-sdhc-card-usb-reader-for-1gb-2gb-4gb-8gb/q/sellerid/23962916/loc/101/213271933.html) or in almost any store with a good selection of electronics.

yours phone not supported 2 gb memory card

the card shows sign of a rom ic being lost its firmware

check that you didn't lock the card by mistake- there is a small "sliding door"- make sure it is covering the hole.

check ur mobile specification on internet

Too old of hard ware, SDHC secure digital hig compression, is preventing it from working. got to get a sd card that is not SDHC

The PIC or EEPROM inside these cards may not be working. I guess you best bet is to buy a new one try Kingston brand or go with another Sandisk.