Most new phones don't have a 3.5mm headphone jack, so you need an adapter or wireless connection to use aux cables
If you have an older aux cable (the thin 3.5mm jack that plugs into car stereos, speakers, or headphones) and a newer phone without a headphone jack, you have three working options: a USB-C or Lightning adapter that lets you plug the aux cable in directly, a wireless adapter that connects via Bluetooth, or a cable with a built-in digital converter. Which one works depends on your phone model, what device you're connecting to, and whether you want a permanent solution or something you use occasionally.
The reason new phones dropped the headphone jack is partly size — removing it freed up space inside the phone — and partly business: phone makers make more money selling wireless earbuds and adapters than they do from a free jack. But the aux cable itself hasn't gone anywhere. Millions of car stereos, home speakers, and audio systems still use aux input, so the adapters exist and work reliably.
Key Takeaways
- A USB-C or Lightning adapter (depending on your phone) plugs into your charging port and gives you a 3.5mm jack for aux cables, costing $10 to $25.
- Bluetooth adapters let you connect wirelessly to aux-input speakers or car stereos without plugging anything into your phone, though they add a small delay to audio.
- Some aux cables have a digital converter built into one end, designed specifically for phones without headphone jacks.
- Using your phone's charging port for audio means you can't charge and listen at the same time unless you buy a splitter.
USB-C and Lightning adapters: the direct plug-in method
If your phone has a USB-C port (most Android phones made after 2018) or a Lightning port (all iPhones since the iPhone 12), you can buy an adapter that converts that port into a 3.5mm headphone jack. You plug the adapter into your phone's charging port, then plug your aux cable into the adapter's jack. The audio plays through the cable exactly as it would on an older phone.
These adapters cost between $10 and $25 depending on the brand. Apple's official Lightning adapter is around $9. Third-party USB-C adapters from brands like Anker or Belkin run $12 to $20. They're small enough to keep in a car or bag, and they work when ready — no pairing, no setup, no batteries needed.
The main limitation is that you're using your phone's charging port, so you can't charge your phone while you're listening. If you need to do both, you can buy a USB-C or Lightning splitter (sometimes called a hub) that gives you multiple ports, but that adds cost and bulk. Some people keep an adapter permanently plugged into their car's aux cable so they don't have to carry it.
Bluetooth adapters: wireless connection to aux speakers
A Bluetooth adapter is a small device that plugs into an aux input (like on a car stereo or home speaker) and receives audio wirelessly from your phone. Your phone connects to the adapter the same way it connects to wireless earbuds. The adapter then sends that audio through the aux cable to the speaker.
This solves the problem of not being able to use your charging port, and it means you don't have to plug anything into your phone. Bluetooth adapters cost $20 to $60 depending on the brand and features. Popular options include the TaoTronics Bluetooth receiver or the Anker Soundsync. Most run on rechargeable batteries that last 10 to 20 hours per charge.
The trade-off is a small delay — usually less than a second — between when you play audio on your phone and when it comes out of the speaker. This doesn't matter for music or podcasts, but it can be noticeable if you're watching video and the sound is out of sync with the picture. Some adapters have a "low latency" mode that reduces this delay.
Aux cables with built-in digital converters
Some aux cables are designed specifically for phones without headphone jacks. One end has a USB-C or Lightning connector that plugs into your phone, and the other end is a standard 3.5mm aux jack. The converter is built into the cable itself rather than being a separate adapter.
These cables cost $15 to $30 and work the same way as a separate adapter — you plug the digital end into your phone and the aux end into your speaker. The advantage is that everything is in one piece, so there's nothing to lose. The disadvantage is that you're still using your charging port, and if the cable breaks, you have to replace the whole thing rather than just the adapter.
Comparing your options side by side
| Method | Cost | Setup | Can charge while using | Best for |
|---|---|---|---|---|
| USB-C or Lightning adapter | $10–$25 | Plug in, use when ready | No (unless you buy a splitter) | Car stereos, home speakers, occasional use |
| Bluetooth adapter | $20–$60 | Pair once, then wireless | Yes | Speakers you use regularly, situations where you need to charge |
| Aux cable with converter | $15–$30 | Plug in, use when ready | No (unless you buy a splitter) | People who want one cable for everything |
What to check before you buy
Before you order an adapter, confirm what type of port your phone has. iPhones from the iPhone 12 onward use Lightning. iPhones from the iPhone 6 to iPhone 11 also use Lightning. Most Android phones made after 2018 use USB-C, but some older models use Micro-USB (a smaller, older connector). If you're not sure, search your phone model plus "charging port type" or look at your phone's charging cable — the shape of the connector tells you what you need.
Also check what you're connecting to. If it's a car stereo or home speaker with an aux input, any of the three methods will work. If it's a device that only has Bluetooth (like some newer car systems), you don't need an adapter at all — your phone can connect directly. If it's an older device with only aux input, you need either a wired adapter or a Bluetooth adapter.
Frequently Asked Questions
Will using an adapter damage my phone's charging port?
No. The port is designed to handle both charging and data transfer, and an audio adapter is just another data device. Plugging and unplugging an adapter thousands of times over years could eventually wear the port, but normal use won't damage it. If you use the same adapter every day in your car, the wear happens to the adapter cable first, not the port.
Can I use a cheap adapter from a dollar store or gas station?
Cheap adapters usually work, but they're more likely to have loose connections that cause crackling or cutting out. Spending $12 to $15 on a brand-name adapter from Amazon or Best Buy gives you better build quality and a warranty if it fails. If you're only using it once or twice, a cheap one is fine.
Why does my aux cable sound worse through an adapter than it did on my old phone?
The adapter itself isn't the problem — digital-to-analog conversion is the same whether it's built into the phone or in an external adapter. The issue is usually the cable. Older aux cables can develop internal damage or corrosion that makes sound quality worse. Try a different cable to see if the problem is the cable or the adapter.
Do I need a special aux cable for an adapter, or can I use any aux cable?
Any standard 3.5mm aux cable works with any adapter. The cable doesn't know or care whether the jack it's plugged into is built into a phone or attached to an adapter. If a cable worked on your old phone, it will work with an adapter on your new phone.
What's the difference between a USB-C adapter and a Lightning adapter?
They're the same technology — both convert digital audio to analog — but they plug into different ports. iPhones use Lightning, most Android phones use USB-C. You need the one that matches your phone's charging port. Buying the wrong one won't damage anything, but it won't fit.