1.Someone可以改成Somebody;
2.called可以改成phoned/telephoned/rang,同时还可以在you和just中间加入up;
3.called you还可以换写成made a phone/telephone call to you;
4.just now可以改成a moment ago;
以上变化组合,即可构成多个同义句.
甚至还可以这样写:You were wanted on the phone just now.
同义句变换可以有多种形式,希望楼主最好能提供变化格式.