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Mar 16, 2026

Why your keyboard won’t work on your phone without that tiny OTG adapter

Before I got a laptop, I used to work on my phone with a keyboard connected via an OTG. It wasn’t a fancy phone - just a Galaxy J2 with a micro-USB port. I used a membrane keyboard with a cheap $0.4 OTG adapter, but it got the job done. I put the savings towards a laptop and once I bought my first laptop, forgot all about that OTG hack I was using.

Fast forward to 2026 - I have a Redmi 10 Prime with 6GB RAM and an 8-core helio G88 chip. And a type-C port.

I have my mechanical keyboard connected to my pc with a type-C cable. My phone also has a type-C port, so I thought maybe it would work.

I connected them.

Nothing.

I visited some shops, tested flimsy $1 OTG adapters, and one worked. Today, I paired that with a USB hub and it works. Perfectly.

This got me curious. Why do I need a $1 adapter for something that should just work. And more importantly - if my phone is powerful and supports all peripherals I need - why did I carry around a laptop?

The host/peripheral problem

For USB peripherals to work, every connection needs a host and a peripheral. On my pc, the pc is the host, and the keyboard is peripheral.

When Ajay Bhatt and his team at Intel invented USB in 1996 (yeah, it’s not that old!), they wanted to replace weird ports on PCs (serial, parallel, PS/2) with a simple cable. The host has to supply power (5V via VBUS), schedule data transfers, manage USB bus, and handle enumeration when devices connect. USB is made to solve exactly that.

USB says you’re either a host or a peripheral. Not both. That’s when USB Implementers Forum released the On-The-Go specification in 2001 - a simple cable with ID pin decides who’s the boss.

Why Type-C cable doesn’t work for keyboards

Like USB, USB-C is supposed to replace all kinds of cables and they use configuration channel (CC) pins. They don’t have an ID pin.

When two USB-C devices are connected, they negotiate roles using USB power delivery protocols. Phone defaults to peripheral mode. Keyboard is always a peripheral.

So when I connect a phone to cable with a USB-C cable, nothing happens. OTG adapter has the ID pin grounded (or CC pins configured)- phone sees this, and goes - I’m the boss now.

The problem with OTG

I find OTG adapters very useful. However, you need a separate adapter - which is the annoying part. Some phones don’t even support it (phones need to have android.hardware.usb.host.xml files).

For micro-USB devices, it makes sense to have OTG cables because the ID pin was critical. For USB-C, the spec was supposed to support this natively.

Type-C cables that combine OTG

They exist. Sort of. They are not standardized.

I think a better solution is USB-C hubs with OTG. These have:

I’m using exactly this at the moment! My hub doesn’t really have a type-C input so I have the type-C OTG adapter connected to the USB hub.

The real question: why do we even need laptops?

This is where it gets interesting.

Samsung DeX came out in 2017. Connect your phone to a monitor, add keyboard and mouse, and you get a proper desktop environment that looks like a cute Linux distro. Supports multiple windows. As of 2026, DeX supports:

It’s amazing for a phone to do that! It’s not going to replace my pc for ML experiments, but for reading, watching videos, and office work, I’m sure it would suffice. Many of us don’t care about calibrated, 144Hz 4K displays- any 1080p screen from 2015 would be fine.

The laptop replacement thesis

We’ve come a long way from Android phones that took a while to open multiple browser tabs.

Modern phones come with 6-16GB RAM and lots of storage. We forget that phones are also computers. The Snapdragon 8 Gen 3 or Apple A18 is faster than many laptop CPUs. Battery lasts all day, camera is better than what’s on laptops.

You’re missing a big screen, peripherals and a desktop OS. But honestly - if you could (1) connect to an external monitor, (2) add peripherals, and (3) have a desktop interface with windows, you’d basically have ONE device that does it all.

DeX does it already. Google is working on it- Pixel phones have a desktop mode in beta. Apple could definitely have this- they have the hardware. They have iPadOS.

Why they’re not pushing it

Think about it. With devices like Apple’s, you’re buying a $1,200 laptop, $800 phone, and an $600 tablet. If you bought a $1200 flagship phone, some cheap USB-C hub, portable monitor, and cheap peripherals, you’d have the same thing.

One device for everything. Think Samsung’s S25 with DeX for email, docs, web browsing, everything. It’s not a workstation, but it’s good enough for everything else.

I’m not a fan of MacBook Neo and Apple’s approach

The MacBook Neo has an A18 Pro chip. The same chip in iPhone 16 Pro. Costs $599. You could have the same thing with just your iPhone and a display if they made something like DeX.

The same damn chip.

Samsung’s approach makes sense. Your phone is your computer. Need a big screen? Plug it. Need keyboard? Plug it. One device. One OS. Everything is synced. No airdrop. No low-energy bluetooth. It’s the same bloody device.

Do you really want to have iPhone for mobile, iPad for relaxing, and Mac for real work? That’s three devices, three operating systems, three expenses.

Power draw and Battery life

I think not all apps scale well to desktop. But mobile app devs are already building for responsive layouts.

If you’re connecting a mechanical keyboard to your phone and using it with LEDs off (like I am), the power draw is minimal. It’s barely noticeable, and frankly, you could save more battery by lowering some brightness on your phone.

Most people don’t need Photoshop or heavy editors - we’re moving to web apps anyway. There’s a web version of Photoshop. Google Docs lives on the web.

How to try this yourself

I wrote most of this story on my Redmi 10 Prime with my keyboard connected to a USB hub (via an OTG adapter). It works perfectly. I’m using Termux with Neovim to push to the repo to trigger a build on my personal site (where I originally wrote this), but you can literally use anything you want.

You don’t need a flagship or even an S9 for this. Check if your phone supports OTG (maybe a Google search), get a cheap OTG adapter,. And connect it to your keyboard. You can try to Force Desktop Mode in developer options. It’s less polished than DeX, but works.

If you have an iPhone, Apple is laughing at you.

What’s next

USB4 ( 2019, updated to v2.0 in 2022) has dual-role support baked in. It supports both host/ peripheral modes upto 120 Gbps.

I think OTG support and windowing features will be baked into AOSP , and maybe every Android phone will support it out of the box someday.

Final thoughts

I’m still fascinated by OTG adapters. If USB-C fixed the dual role support thing, we won’t need dongles in the future.

Maybe we’ll be able to use our phones instead of our laptops.

Today, your phone has more compute than a 2015 MacBook Pro. It just needs a monitor, a keyboard, and software that treats it like a computer.

Footnotes:

  1. Ajay Bhatt invented USB  at Intel in the mid-1990s. Intel owns the patents but made the technology royalty-free. Bhatt received India’s Padma Shri award in 2025.

  2. Force Desktop Mode Developer Settings was meant for app devs testing resizable windows. It can work as a desktop environment if you’re in a pinch.

  3. Motorola’s Lapdock  (2011) tried mixing phone + computer with their Atrix phone. It was ahead of its time. Microsoft tried with Continuum on Windows Phone (2015). Samsung DeX (2017) is finally working because the phone hardware is powerful enough and the Android ecosystem is mature today.

  4. Apple’s resistance to desktop mode on iPhone is strategic. If iPhone/iPad could replace laptops, we wouldn’t need products like MacBook Neo.

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