We tiled over our landline phone box in the kitchen when we installed our backsplash. We hadn't used it in 8+ years, and it was ugly. There are still phone boxes in every bedroom upstairs, and in our office downstairs in case someone ever wants to hook up a landline. No one we know has a landline except for my 80 yr old in laws (and they only receive recorded advertising calls on it, very annoying).
Maybe reconsider if it's the only landline box in your house, but most houses have multiple phone boxes so IMO the kitchen one can go.

People like us, with weak cell reception definitely want land lines. But if there are other jacks in the house, I wouldn’t worry about losing one of them. Are you sure there is only one? We sacrificed one in the kitchen, it was in the way of the best location for the range and backsplash.

Are you remodeling for resale? If not, then you might be able to pull the wire up into the attic. If it's not too big of a bundle, put it in a junction box for the future.

If you're flipping the house, tile around it and put a blank cover on the box.

We are not remodeling specifically for resale. We will probably won't sell for at least 5 years.

I’d tile over it

We covered all our landlines up with drywall before we painted. I don't think it is a must have for buying a house.

I wouldn’t worry about it unless you are out in the country with limited cell reception. We haven’t had a landline in probably 5 years and I just realized I have never seen a jack in the house we have owned for a year now. There wasn’t one in the kitchen before the remodel and won’t be on in it after.

If you already have the line installed in the wall, I would normally close it up in a box or some other mechanism that allows access later on if someone wants to make it active. However, the most common use for land lines now (assuming cell service works) is a fax machine, and I don't expect anyone to set up an office and use a fax in the kitchen. Its probably not worth it to keep the jack.

Many financial companies and real estate services still use fax because internet email is insecure and should not be used to send personal information (SSNs, bank account numbers, etc.). Sending personal information by email is like writing it on a postcard and putting it in the US mail. However, companies are slowly swapping over to secure messaging services that allow you to upload and download documents securely when you are applying for loans or closing on real estate.

Bruce

A phone jack in the kitchen is unnecessary for current use.

As others have posted, most homes have jacks in bedrooms as well as other areas. I do maintain a land line because it's cheap and I don't have to give my cell phone number when I don't want contact on my cell. However, most people now use wireless phones anyway - most base phone unit with answering machine is in my bedroom and I have two wireless phones elsewhere in the house so extension phones plugged into jacks - especially in a kitchen are truly useless - even to a Luddite.

However, when I had DSL internet, the modem was connected to my phone jack if I recall correctly. I now have cable internet so everything is through the cable connection.

A true wired phone is actually a good thing to have although it is increasingly rare. By true wired, I mean an old fashioned connection because the signal will be available if there is no electricity or when cell circuits are jammed in an emergency situation. Unfortunately I made the mistake of upgrading without realizing the difference and should have just stayed with the old fashioned technology as an emergency backup.