- Big button phones use large, high-contrast keys and displays to help people with reduced vision or dexterity make calls more easily.
- Hearing aid compatibility commonly relies on a telecoil, often called a T-coil, which lets a hearing aid pick up the phone's signal directly when set to its T position.
- Handsets may carry M and T ratings, where M relates to acoustic coupling and T relates to telecoil coupling performance with hearing aids.
- Under Ofcom's General Conditions, providers must have and comply with policies to meet the needs of disabled customers, including accessible formats and access to an approved relay service.
- The PSTN landline network is being retired as Openreach completes the all-IP migration by 2027, so accessible handsets increasingly connect through a digital voice router.
Big button phones offer large keys, big displays and louder sound; hearing aid compatible handsets use a telecoil so a hearing aid picks up calls clearly. Ofcom rules require providers to support disabled customers.
Last reviewed: June 2026
What a big button phone offers
The defining feature of a big button phone is exactly what the name suggests: keys that are noticeably larger and more widely spaced than a standard handset, with high-contrast numbers that are easier to see. This helps people who have reduced vision, tremor or limited dexterity to dial accurately without misdials. Many models pair the large keys with an oversized display showing big, clear digits for the number being dialled or the caller's identity.
Beyond the keys, big button phones typically add a loud, adjustable ringer so an incoming call is not missed, and an amplified earpiece or speaker that raises the volume of the person speaking. Simplified menus reduce the number of confusing options, and many include one-touch memory keys, sometimes with photo labels, so a frequently called contact can be reached with a single press. Together these features support confident, independent use.
Big button phones come in both corded and cordless versions. A corded model stays in one place and does not need charging, which suits a user who always calls from the same spot, while a cordless handset can be carried around the home but must be kept charged. Some sets include several handsets that share one line, useful in a larger home, and a base station with an answering machine that announces messages clearly. Considering how and where the phone will be used helps narrow the choice.
How hearing aid compatibility works
Hearing aid compatibility is about making sure a handset works cleanly with a hearing aid rather than producing whistling, buzzing or muffled sound. The most common mechanism is the telecoil, frequently written as T-coil. A telecoil is a small component inside many hearing aids that, when the aid is switched to its T position, picks up a magnetic audio signal directly from a compatible source such as a phone earpiece.
Using the telecoil with a compatible handset routes the caller's voice straight into the hearing aid, cutting out room noise and the feedback that can occur when a hearing aid microphone is placed near a phone speaker. The result is clearer speech and a more comfortable call. Not every hearing aid has a telecoil, so it is worth checking with an audiologist whether yours does and how to switch to the T setting.
For people who do not use a hearing aid, or whose aid lacks a telecoil, an amplified handset is the alternative worth considering. These phones boost the volume of incoming speech, often with a dedicated control, and some also adjust the tone to make higher or lower frequencies clearer. The aim in both cases is the same: to deliver speech to the listener in a form they can follow comfortably. Choosing between telecoil coupling and amplification depends on the individual's hearing and the equipment they already use.
Understanding M and T ratings
Handsets are sometimes labelled with ratings that indicate how well they perform with hearing aids. The M rating relates to acoustic coupling, which is how the handset works when the hearing aid is in its normal microphone mode. The T rating relates to telecoil coupling, which is how the handset works when the hearing aid uses its telecoil. A higher number on each scale generally indicates better performance in that mode.
If you use a hearing aid in the T position, the T rating is the one to look for, and confirmation that the phone supports telecoil coupling is the most relevant detail. If you do not use a telecoil, an amplified phone with strong acoustic performance and adjustable volume may suit better. Checking the product information for these ratings before buying helps match the handset to how you actually hear.
It is worth remembering that the rating is only part of the picture. How the phone feels in the hand, how easy the controls are to operate and whether the display is readable all matter alongside the coupling performance. A handset that scores well on paper but is awkward to hold or has a fiddly volume control may be used less than a simpler model that suits the person. Where it is possible to try a phone before settling on it, that practical test often reveals more than the specification, particularly for older users adjusting to new equipment as the network moves to digital voice.
Accessible phone features and who they help
The table below maps common accessible features to the users who benefit most.
| Feature | What it does | Who it helps |
|---|---|---|
| Large high-contrast keys | Easier, more accurate dialling | Reduced vision or dexterity |
| Telecoil (T-coil) | Sends audio direct to hearing aid | Hearing aid users in T mode |
| Amplified earpiece | Boosts incoming speech volume | Hearing loss without hearing aid |
| Loud adjustable ringer | Makes incoming calls noticeable | Hearing loss |
| Photo memory buttons | One-touch calls to key contacts | Memory or dexterity needs |
Finding accessible handsets and what providers must do
Accessible handsets are sold through general retailers as well as specialist suppliers, and many can be used with any landline or digital voice service. When choosing, match the features to the user's needs: large keys and a big display for sight or dexterity, telecoil support for hearing aid users, and a loud ringer for those who miss incoming calls. As the all-IP migration completes by 2027, most handsets connect through a router with a telephone socket rather than a traditional wall socket, so check the phone works with a digital voice setup.
On the provider side, Ofcom's General Conditions require communications providers to have and follow policies to meet the needs of disabled customers. This can include offering or signposting accessible equipment, providing bills and contracts in accessible formats such as large print or braille on request, and giving access to an approved relay service. If you are unsure what a provider offers, contact its accessibility team and explain the specific needs so it can advise on suitable products and support.
When buying an accessible handset, check a few practical details before committing. Confirm the phone is compatible with the type of line in use, whether a traditional socket or a digital voice router, and that the ringer and earpiece volumes go high enough for the user. If hearing aid use is a factor, verify telecoil support specifically rather than relying on a general claim of compatibility. Trying the phone in everyday conditions for a short period, where possible, is the best way to confirm it genuinely suits the person, since comfort and clarity are easier to judge in real use than from a specification sheet.
Frequently Asked Questions
What is a big button phone?
A big button phone is a handset with large, widely spaced, high-contrast keys and usually a big display, making it easier to dial and read for people with reduced vision or dexterity. Many also feature a loud ringer, an amplified earpiece and simplified menus. The goal is confident, independent use.
What makes a phone hearing aid compatible?
Compatibility usually relies on a telecoil, or T-coil. When a hearing aid is switched to its T position, it picks up a magnetic audio signal directly from a compatible handset, cutting room noise and feedback. Handsets may carry M and T ratings showing acoustic and telecoil coupling performance.
How do I find accessible phones from my ISP?
Contact your provider's accessibility or customer team and explain the specific needs, such as large keys or telecoil support. Under Ofcom's General Conditions, providers must have policies to meet disabled customers' needs and can offer or signpost suitable equipment. Accessible handsets are also sold through general and specialist retailers.
Are ISPs required to provide accessible landline phones?
Ofcom's General Conditions require providers to have and comply with policies to meet the needs of disabled customers, including accessible bills and contracts on request and access to an approved relay service. While the rules focus on accessible services and formats, providers are expected to support disabled customers and can advise on suitable handsets.
What is the T-coil feature on a phone?
The T-coil, or telecoil, works with a hearing aid that has its own telecoil. When the hearing aid is set to the T position, it receives the phone's audio as a magnetic signal directly, rather than through the aid's microphone. This produces clearer speech and reduces background noise and feedback during calls.
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