Shares of Crown Castle (CCI 4.26%), a real estate investment trust (REIT) that is one of the largest owners and operators of cellphone towers, were moving higher after the company pleased investors with its fourth-quarter earnings report, topping estimates on the top and bottom lines.As of 12:47 p.m. ET, the stock was up 3.4%. Crown Castle tops a low barCrown Castle's business shrank in the quarter, with revenue down 5% to $1.67 billion, ahead of estimates of $1.65 billion. That decline was attributable to ...