Hello, this is Xiao Ming (speaking), who's that (speaking),please?
打电话时,一般不直接问 who are you, 这样是相当鲁莽的,常用的是who's that speaking
hello,This is Xiaoming,who's that speaking?
电话里称自己,不要用I am,,,而是THIS IS
hellow,i am xiaoming。who are you please?
hellow, this is xiao ming, who's that speaking?
Hello, (this is) Xiaoming speaking, who is it? 或者 who is that? 都可以