The service is free either way, and you can switch Numbers easily.

这个服务是免费的，你可以很容易地转换号码。

youdao

They play eight-man ball, although if a bigger school comes to town they switch numbers with every possession, so that each side can practice its plays.

他们按八人制的规则打球，如果来镇上比赛的学校人比较多，他们就会在每次控球权转换时调整人数，这样双方都能按自己习惯的规则打球。

youdao

When I came to Liverpool Craig Bellamy wore that shirt so I couldn't have it, so when he left I asked if I could switch numbers and thankfully it was possible.

当我来利物浦的时候贝拉米穿着这个号所以我没能得到它，后来他走了我赶紧问可不可以让我换号码，幸好这是允许的。

youdao

So, if you'd like to switch into one of these three, they have very low numbers right now.

如果你们想要更改去上这三个课程，还有些名额。

麻省理工公开课 - 固态化学导论课程节选

But it seems unlikely that the switch will be sudden, and those import numbers suggest it has not happened yet.

ECONOMIST: Making sense of the fall in commodity prices

It was announced a few months back that Star Wars: The Old Republic, in the face of dwindling player numbers, would be making the switch to free-to-play sometime this fall.

FORBES: Star Wars The Old Republic: Free to Play November 15th

There are no official numbers yet on how many people have made the switch.

CNN: Some Republicans would rather switch than impeach