In the past month or so I went from constantly dropping calls dozens per day to consistent LTE and smooth handoffs on Route 4 more or less from Englewood & Fort Lee all the way down to Route 208 and up thru to Hawthorne/Wyckoff. Data speeds ranging from 10mbps to 20mpbs with pings under 100.
EDIT: LTE also shows up at Starbucks on Route 17 South & all over the place in Paterson, Little Falls, Parsippany & even a little in Wayne.