LANDLINE PHONES.
It is worth considering the advantage of a landline or digital phone.
Although mobile phones have good unlimited minutes deals, landlines are still popular with a telephone handset which is more comfortable than a mobile phone held to the ear for a long time unless you use a headset, and handsfree is easy to use on a traditional phone with a one button press.
Also, mobile phones can go flat easily on a long call, and many mobile require a daily charge up.
If using PAYG mobiles they can soon run out of credit, which I myself use as a light user of mobile phones, so if switching to mobile phones only, a contract would be needed for regular or use/longer calls.
However the copper phoneline system may be phased out in 2025 with phones then connected to fibre cable hubs, so may need to have battery backup and a mobile link for vulnerable people.
So if switching, it is worth considering the options available regarding the landline/digital phone if you still do need one.
There are other options such as a sim used in a traditional phone designed to work with a sim but it would not be a geographic number.
I also understand if moving house a landline phone number can only be ported within the same geographic area.
The rollout of fibre cable to replace the old copper open reach ADSL cables seems slow if it is to replace the copper cable by 2025, some may try mobile 4g or 5g broadband and ditch the landline, but the mobile mast connectivity and speed varies with location.
Virgin have been a leading supplier of fibre cable broadband and I have used it for many years as well as the landline phone which even works in a power cut, except once the phone would not work when there was a longer outage due to a sub station fire.
Mobile phones can also fail due to system faults or be discontinued, I have had to switch mobile provider several times due to this.