Just want to share my experience.I've had my speed doubled for a few weeks now: from 512kbps to 1mbps. I never received any SMS or email regarding this.But I've been getting my old speed of 512kbps for past two days. My initial thought was that I had crossed my FUP limit already. Called up airtel. I asked the CSR what my current plan was and what the fup limit on this plan was. He took a while to check around and told me three things:* that my speed has been doubled to 1mbps speed since 12th of this month.* that I am on an old plan which is not there on his screen of current plans. (Hopefully, it means I am not on the currently available 1mpbs packages with the 15GB FUP)* that my current FUP limit is 100GBThe csr seemed pretty confident on the third point but I'll have to confirm it this bill cycle to see how much the FUP really is.Regarding the 512kbps speed drop I was experiencing, he asked me to wait a few more minutes while he "refreshed a backend setting" or something. He asked me to restart the modem and my speed is now back to 1mbps.So, overall, a great evening with airtel