FREEPHONELINE - Can I use ONLY for voicemail, without phone?

Hoping someone can help.
We've got our home phone line that we've had for years, and, realisitically, virtuall NOBODY of any importance calls us on the home phone anymore. Just on our cells. But, occasionally there's someone we had forgotten about, some relative that forgot, or didn't get the memo. Otherwise, it's just 3 calls a day for air duct cleaning.
My ideal solution is getting the number ported to some sort of VOIP service, and then, just have it go IMMEDIATELY to voicemail, and then do a voicemail to email and we can all get the voicemail immediately, and call them back if needed from our cells.
So was thinking, could I use freephoneline for this? I wouldn't even bother getting an ATA, as, I will just get rid of the home phone completely. I don't even want the phone to ring. So I wouldn't even buy an ATA, or don't even have a need for the SIP codes. Is this a possibility to just get the number from freephoneline and that's it???
Or am I missing something else we would need?
Thanks
We've got our home phone line that we've had for years, and, realisitically, virtuall NOBODY of any importance calls us on the home phone anymore. Just on our cells. But, occasionally there's someone we had forgotten about, some relative that forgot, or didn't get the memo. Otherwise, it's just 3 calls a day for air duct cleaning.

My ideal solution is getting the number ported to some sort of VOIP service, and then, just have it go IMMEDIATELY to voicemail, and then do a voicemail to email and we can all get the voicemail immediately, and call them back if needed from our cells.
So was thinking, could I use freephoneline for this? I wouldn't even bother getting an ATA, as, I will just get rid of the home phone completely. I don't even want the phone to ring. So I wouldn't even buy an ATA, or don't even have a need for the SIP codes. Is this a possibility to just get the number from freephoneline and that's it???
Or am I missing something else we would need?
Thanks