I have an LG Terra with LTE, purchased in June 2016. For the past two months I've been unable to get phone service in the NYCTA subway stations. I have no problem on the street. This is at ALL the stations including main transfer stations like 59th St/Columbus Circle, Broadway/Lafayette and West 4th St. Last week I picked up service at 59th St/Columbus Circle only but then yesterday, nothing. Is there some change in the service or do I need to change my phone settings?