Both of my Chase freedom and Citi double cash are 24 months old. I got an email from chase this afternoon telling me that they have increased my limit from $3k to $6k8. Then another email from Citi with an offer for cli. I logged into my citi account and found my way to credit limit increase button, input some of my basic infos and hit submit (after reading "no credit report is needed), aand got a new limit of $4k8, $1k5 increase from $3k3.
Thank you all. Just FYI, my score increased after I paid off my balances at the end of promotional introductory period on those cards. I had also added 4 new accounts with nearly 30k combined to my report a month before chase and Citi offered me Cli. I was kinda surprised since I had been hearing how conservative chase is and it is unlikely to offer automatic or SP cli.