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Doing my research before apply, I only knew of the gold and platinum. Gold has a $59 anual fee and platinum does not have one. That would be awesome to eventually get signature. How much is your limit if you don't mind me asking? Signature is for 5k+ Visa cards, right? Did you get that as a SL or CLI?
Dont let the low SL on the Discover bum you out...
Some Discovers tend to grow like weeds, or slow and steady......
Use it a bit... and you might see something at or right after your third statement....
If you do get the auto-cli .... hit the CLI button...
=)