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I started at $600 and now I am at $3500 after calling the backdoor number once
Yes, you can call in or the best way I think is through chat. Log into your account during normal business hours and you can see a bubble that says chat with a rep. Ask them for $25k, they will counter offer you. I have had multiple increases with that card. I started out in Feb with $600 and now I am at $6000. I just got some auto love from them because I didn't ask for a month. I have only used the card one time for $17.00 and I paid it off before I even got the statement. They are excellent with the cli's.
Congrats!
get the physical card and get it set up for online access and click chat when its available in the daytime. You will get a bigger limit! And then repeat in a month or two ! Mine started at 800 in april and was at 6k in 60 days!