John would like to keep his legacy phone number and just use it for voicemail. Leo says he can port his phone number to a service, and he likes Grasshopper. There's also Google Voice, but John says that they won't port landline numbers. When he does port his number to a service, he will no longer have a landline phone, so he should keep that in mind.
A landline is crucial in cases of disaster or emergency because they know exactly where you are when you call. Whereas a cellphone or VOIP is regional.