电话号码升位的英文：
upgrade telephone number

upgrade是什么意思：
n. 上坡，上升；升级
v. 改良，升级；晋升，提升

Companies need to upgrade servers.
公司需要对服务器升级。

He was upgraded to security guard.
他被擢升为保安。

The first is upgrading our infrastructure.
首先，我们要改善我们的基础设施。

telephone是什么意思：
n. 电话
v. 打电话，通电话

Receptionists'telephones are always engaged.
接待员的电话总是占线。

I have to make a telephone call.
我必须打个电话。

I telephoned to thank her.
我打电话向她道谢。

number是什么意思：
n. 数；号码；算数
v. 给…编号；计算，数

The number was fifty.
该数字为五十。

There is safety in numbers
人多势众

It was an irrational number.
这是一个无理数。