In regards to credit limit increases, I’ve been offered a couple line increases recently without asking for them specifically on cards with regular and occasional heavy usage. Example: I regularly charge 60 to 70% of my credit line on one of my AMEX cards monthly and after consistent monthly payoff, AMEX seems to trust me more with a higher limit and automatically increased my limit about 30%. Another CITI card sees regular minimal (10%) spend but after one month of higher (60%) spend offered me a no-hard-pull 20% line increase. Other cards I rarely use are rare to see a credit line increase offer.
My data points being, you can ask for a line increase and it may be hit or miss and depending on the issuer will often require a hard pull. However, if you have regular mid to occasional heavy usage (try to keep it below 80%) issuers are usually happy to see that you use and are responsible with paying off their cards and are much more likely offer you no-hard-pull increases after 6 to 12 months of opening and using their cards.
Shinobi, your Alliant 2% card question was asked and answered, but issuers certainly do have a mind for total credit you have with them. I’ve regularly seen cases where if you have a high line or two with them already then they may approve you for another card but with a much lower limit. Likewise, cancelling a high line with an issuer then later reapplying for a new card will also likely grant you a higher initial line when approved, because you have less total credit with them. This seems to be common practice among issuers and I have several personal data points to suggest this.