I've asked this question before as well as called as well as gone into stores.
I am in a 4G area. Not on the fringes of it, but right in it. Most days I am on 3G. I'd rather have the 4G that you advertise and promote and ultimately I pay for, but 3G works so whatever. Since 6am this morning I cannot get anything other than 1x, and I've lost that several times.
This is not the first time this has happened. It happens on average once a week...I am "using" 1x the entire day. I even posted something on here just a few weeks back....no reply from customer service....GO FIGURE!