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866-811-4108 is the number in the sticky. In my case I've never tried prior to 6 months, but when I did (1 week shy of 6 months) I was at $2500 limit and requested $10k. They did not give instant decision, I logged in the next day and it was increased to $5k.
^^
Interesting. Do you recall whether it was a HP or SP? If HP, remember which CRA's?