Last week I traded out of my Galaxy S2, which consistently got 3-4 bars at home, to a Galaxy S4, which consistently gets 0-1 bars at home (and occasionally shows no signal at all). What has changed in a week's time?
Yes, I know there's Wifi calling, but as far as I'm concerned that's excuse making because it doesn't address the actual problem of why your network (and the phones you sell to work on it) isn't working now as it did a week ago.