I'll let you in on a secret.
the trick to get your limit higher is this:
get a card froma big bank like mbna or citibank. (i like mbna because of their website)
always use your card for everything you can, pay your bills on it, buy food on it, just make sure you have the cash to pay the whole thing off every month, no exceptions!
after 6 months apply for another credit card from the same bank i.e. mbna if you have a good history of using your card and paying large on time payments you should be approved.
here is the trick when they approve you, ask them to merge your credit lines, since the same bank is giving you these cards they have no problem just putting it on one card instead of two.
so if your credit limit was 1500 it is now 3000 or more.
to add to this trick do the following:
now that you have one 3k card goto to another bank so if you had a mastercard get a discover or amex (amex are kind of tight asses so i wouldnt do these tricks with them until your limit is above 10g) apply for a discover and they should give you a similar limit fill one card up to the brim and then request a balance transfer from one card to another, when you request they usually will raise your limit automatically, if they dont offer ask!
violia! now you have a card that has a 6k limit and one that has a 3k. after a few months of paying off your bills, (clean cards people!!! you dont want to pay the cc companies interest) call the one with a 3k limit and tell them that your other cards give you a 6k limit and you want them to raise your limit or you'll cancel the card, trust me they'll raise your limit.
now you have 2 cards with 6k limits, repeat adnaseum!
the two rules you must remember is this:
1) NEVER EVER BE LATE WITH A PAYMENT! if you are youve lost allcredibility with them and they will know immediatly when they pull up your account
2) ALWAYS ALWAYS MAKE A SIZABLE PAYMENT A MONTH, IN THE BAD CASE THAT YOU CANT CLEAR YOUR CARD, MAKE A BIG PAYMENT
GOOD CREDIT IS VERY IMPORTANT, LEARNING THE CREDIT GAME IS EVEN MORE IMPORTANT.
Good Luck everyone.
BTW i have 3 cards all with 20K limits ( im not trying to brag just showing you this works) and im only 22 years old, only out of college for 5 months.