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I used to have 2 amex cards... Blue with a $8,300 limit and Delta Platinum with a $12,000 limit... got FRd appx. 2 years ago. Process was simple, I hadn't lied on my application or anything, and after the process was over they increased my delta limit to $15,000 without any request from my part.
I think others have mentioned this to you, but Discover is more picky than amex when it comes to issuing cards. From what I have read in other threads, you are a student with very little income. I would stick to cards that are a little easier to get approved for. Even if you got a discover card issued, it would have an extremely low limit.
I don't lie about income on the apps, I do have some unverifiable untaxed benefits I receive ~$400/mo, that I would LIKE to include, but don't on Amex apps for fear of FR. People seem to think I'm lying on the apps, I'm not :-/. Anyway, Discover's student card usually gives out fair ~$1,000 limits. All I want is a good third card, that's it, I'm done from there.
Do you have any suggestions as to what may be a good third and final card with rewards? As long as the limit is $1k+ I'd be happy, I don't want/need limits I cant pay!