Google has tweaked its call-management app to allow callers to keep their existing mobile phone numbers.

Prior to the change, users had to select a new phone number to use with Google Voice. Now, users can keep their mobile number, with the trade-off that they won't get all the features that come with a unique Google (NASDAQ: GOOG) number, according to Pierre Lebeau, a product manager at Google.

"We know not everyone wants to start using a new phone number, so we've been working on another option for people who are willing to trade some features for the ability to keep their existing number," Lebeau said in a blog post.

The breakdown is as follows: users who sign up for Google Voice with their existing numbers get online, searchable voicemail, automated voicemail transcription, custom voicemail greetings, e-mail and SMS notifications and low-priced international calls.

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