Do cordless GSM landlines exist?

[ImServs]

Im trying to eliminate the need for a modem with my ISP without losing my 25yr old landline (i dont want/need another smartphone laying around).
Im looking for a cordless landline phone that supports GSM. I cant find one anywhere. just a bunch of phone link junk. Is there anything out there i can use? 

[GuiltySpark_]

This is very confusing. What type of internet connection do you have now? You have a modem for it, what is it? DOCSIS? ADSL? Fiber? I'm trying to work out how a traditional cordless phone works into this, then GSM as well? Please explain a little better what you have now.

[ImServs]

10 minutes ago, GuiltySpark_ said:

This is very confusing. What type of internet connection do you have now? You have a modem for it, what is it? DOCSIS? ADSL? Fiber? I'm trying to work out how a traditional cordless phone works into this, then GSM as well? Please explain a little better what you have now.

i have a full fiber ONT. but because of the home phone, it requires the ISP's modem/router combo for the phone to function. I want the modem gone, but want to keep the phone number and have a home phone style device in my home using the number. I was looking for a GSM device so i can hse an existing line with my cell provider as the home phone.

[GuiltySpark_]

Why not just port it to some sort of IP based service? There are plenty of them. 

[ImServs]

2 minutes ago, GuiltySpark_ said:

Why not just port it to some sort of IP based service? There are plenty of them. 

i mean im sure i could, but it baffles me there are no GSM powered cordless landline style phones. wouldnt have to spend extra on an ip based service if they existed.

[manikyath]

GSM but no smartphone... you know 'dumbphones' still exist right?