Unlimited mobile broadband no such thing exists so far in the wireless broadband world

I recently changed my job and my new company gave me the mobile broadband from At&t Wireless to have me available and be able to connect to the Internet 24/7, if they required, because i am involved in a critical IT production system support. I also changed my home close to the office so that my commute time is less, hence it took a little while like 15 days for me to transfer my home Internet connection. Hence i was using the mobile broadband given to me during that time for both personal and office use. I was using it thinking that it's an unlimited plan like watching youtube, checking email, downloading logs from remote systems, remote desktop'ing every others with the commonsense that if if my home Internet connection costs $30/month with unlimited data, shouldn't the wireless broadband be unlimited as well for twice the cost like $60 per month and the cap on the data usage was never heard in the wired Internet world, unfortunately it isn't. There is a 5GB cap on all mobile broadband plan. I am glad that i came to know when At&t sent an pop up message when i was close to the cap, which then prompted me to do further research and get to know more about the plan and didn't embarrass myself by slapping my company with a huge bill. Next day i told some of my colleagues as well and they were also surprised that there is a cap on the usage, so i felt that i am not the only one crazy to think there existed a unlimited wireless broadband. I did some more research to see if any other provider would provide me such a plan , but unfortunately there isn't one , like all the 4 major carriers that i checked , all their mobile broadband plans Verizon Mobile Broadband Plan , At&t DataConnect Plan , Sprint Mobile BroadBand connection Plan - 3G and T-Mobile webConnect Data Plan has some kind of cap on the data usage or you will end up with a huge bill. Hence there is no such thing as unlimited mobile broadband yet so far atleast when this post was written and keeping my fingers crossed to see when on such thing will arrive to become a truly mobile world with the same capabilities as that of a wired world.