It is one thing to learn a new piece of information, such as a new phone number or a new word, but quite another to get your brain to file it away so it is available when you need it.

学习新知识——比如记个电话号码或者一个新单词——是一回事，而将它们存进大脑并在需要时调用就完全是另外一回事了。

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If you memorize a new cell phone number, you may not be able to recall the old one.

如果你记下了一个新的手机号码，你可能就想不起旧的那个。

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Last October, new rules allowed people to keep their mobile-phone number when they change operators.

去年十月起，新的政策允许客户在更换运营商后保留原来的号码。

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Google Voice is a free service that gives callers a new phone number that can be used to ring different real-world phones they own and can send them an email transcript of voicemails they received, among other features.

WSJ: Google Adds Calls to Gmail

The hassle with that option: You have to inform your contacts of your new cell phone number each time.

CNN: Navigating cell phone headaches overseas

Tayside Police have praised the public for embracing the new non-emergency phone number, designed to take pressure off the 999 service.

BBC: Tayside Police praise public for embracing new 101 number