premium-rate
adjective uk/ˈpriː.mi.əmˌreɪt/ us/ˈpriː.mi.əmˌreɪt/
（电话号码或通话服务）高价的，费用高的
A premium-rate phone number or service costs more to call than a normal phone number.
a premium-rate number/line/service 高价号码／电话线路／通话服务
You had to call a premium-rate line to enter the contest. 要参加比赛必须拨打一个收费很高的电话号码。