Quick Answer: A hearing aid compatible (HAC) phone is rated under an FCC-recognized standard for how well it works with hearing aids — an M-rating (M1–M4) for acoustic/microphone interference and a T-rating (T1–T4) for telecoil coupling, with M3/T3 or better counting as compliant. Coverage is about to get much more complete: the FCC adopted rules in October 2024 requiring 100% of handset models sold in the U.S. to be hearing aid compatible, phased in from December 14, 2026 (manufacturers) through June 12, 2028 (smaller carriers) — replacing the old rule that only required 85% of a lineup to comply. If your hearing aid has a telecoil, the T-rating is what to check; if it doesn’t (true of most OTC models), the M-rating is what actually affects your call quality.
Most people never look at a phone’s HAC rating until a hearing aid makes an old phone suddenly buzz or squeal against their ear — and then they can’t find where the rating is even printed. This guide explains what the M and T numbers actually measure, why the rules are changing in 2026, how to check your own phone, and where a landline phone or accessory still fills a gap a cell phone can’t.
Hearing aid phone compatibility by the numbers
- M3/T3 or better is the FCC’s threshold for a phone to be labeled hearing aid compatible, tested under the ANSI C63.19 standard — M4/T4 is the best available rating, meaning the least interference and the strongest telecoil coupling.
- 100% of handset models sold in the U.S. must be hearing aid compatible under the FCC’s October 2024 rule, up from the prior requirement that only 85% of a manufacturer’s or carrier’s smartphone lineup be HAC-rated — a real gap the new rule closes.
- 28.8 million U.S. adults could benefit from a hearing aid, per the NIDCD (National Institute on Deafness and Other Communication Disorders) — a population size that makes phone-level compatibility a mainstream accessibility issue, not a niche one.
The rollout timeline
The FCC didn’t just raise the compliance bar — it phased the deadline by company size, so don’t assume every phone on a shelf is compliant the day you read this:
| Who | Deadline | What changes |
|---|---|---|
| Handset manufacturers | December 14, 2026 | Every smartphone model offered for sale must be hearing aid compatible, not just a percentage of the lineup |
| Nationwide carriers | June 14, 2027 | Major carriers must only stock and sell HAC-rated smartphone models |
| Non-nationwide / regional carriers | June 12, 2028 | Smaller and regional carriers get an extra year to fully transition their lineups |
Until each deadline passes, it’s still legal for a manufacturer or carrier to sell a small share of models without a HAC rating — which is exactly why checking the rating yourself, rather than assuming it, still matters through 2028.
M-rating vs. T-rating: which one is yours?
- M-rating (M1–M4): measures how much radiofrequency interference the phone generates that a hearing aid’s microphone would pick up as buzzing or static. This is the rating that matters for almost every hearing aid, OTC or prescription, since every hearing aid has a microphone.
- T-rating (T1–T4): measures how well the phone’s magnetic signal couples with a hearing aid’s telecoil — a feature most popular OTC brands (Jabra Enhance, Lexie, Eargo, MDHearing) don’t include at all, and that’s present on only about 59% of 2026 hearing aid models overall. See our telecoil guide for how to check whether your specific device has one.
- M3/T3 is the compliance floor; M4/T4 is noticeably better in practice, especially in a noisy environment like a car or a busy street.
- If you don’t know your hearing aid’s telecoil status, the M-rating is the safer one to shop by — it applies no matter which hearing aid you own.
Amplified / hearing-aid-compatible landline phone
- A dedicated amplified landline phone (from brands like Panasonic, VTech, and Clarity) is still the most reliable HAC option for home use — no carrier rollout timeline to wait on.
- Look for a printed HAC rating on the box or spec sheet, plus adjustable volume and tone controls separate from your cell phone's settings.
- Useful as a backup or primary line for anyone who relies on a telecoil at home, even if their cell phone's HAC rating is uncertain.
An amplified landline phone like this typically ships within a day or two — try Amazon Prime free for 30 days if you want it on your nightstand before your next round of calls rather than after.
How to check your own phone
- Look at the spec sheet or box. Manufacturers list the M and T rating together, like “M4/T3,” usually in the accessibility or technical specifications section.
- Check the phone’s accessibility settings. Some manufacturers now surface the HAC rating directly in the phone’s settings menu rather than only in printed documentation.
- Ask your carrier. Retail staff can pull up a specific model’s HAC rating, and under the FCC’s new rules, that information is required to be available, not optional.
- Test it in person if you can. A rating tells you the lab result, but holding the actual phone up to your hearing aid in the store is still the fastest way to notice a bad match before you buy.
A quick health note
Phone compatibility ratings are a hardware spec, not a treatment. OTC hearing aids are intended for adults 18 and over with perceived mild-to-moderate hearing loss in both ears. If you have severe or profound loss, sudden hearing changes, hearing loss in only one ear, ear pain or drainage, or tinnitus that is pulsing or one-sided, see an audiologist or physician rather than relying on a phone rating or an OTC device alone.
Related guides
For more on how hearing aids connect to the devices around you, see our telecoil guide, assistive listening devices roundup, and best hearing aids for iPhone picks.
The bottom line
A hearing aid compatible phone is rated M3/T3 or better under the FCC’s standard, and the practical gap between “some models are compliant” and “every model is compliant” is about to close: 100% compliance phases in from December 2026 through 2028, up from the old 85% rule. Check the M-rating if your hearing aid relies on its microphone (true of most OTC devices), the T-rating if it has a telecoil, and don’t assume the phone in front of you today already meets the new bar — pick up a HAC-rated amplified phone on Amazon if you want one that already does.