what happened to one number for life?

GrandCentral Changes Your Telephone Number Without Consent

GrandCentral is informing select customers that their phone number will change on August 25. The feature-rich service recently acquired by Google bills itself as “one number for life,” which is then linked to your existing phone numbers – unless you are one of the unlucky few who: “have been assigned numbers that are not performing to our quality standards and are being replaced with higher quality services.” GrandCentral’s full email, inside.