The Number Pad Your Laptop Never Had

Anyone who has typed a column of figures on a laptop knows the feeling. The number row across the top is fine for a price or a year. It is the wrong shape for two hundred entries.

That is usually where people buy a separate keypad. Dotori Bluetooth Numpad puts one on the phone instead. The computer installs nothing — it sees a standard Bluetooth keyboard.

The 17-key block, moved

The layout is the one at the right of a full-size keyboard. Seventeen keys, a wide zero, and tall plus and Enter keys. Your hand already knows where they are. That is the whole point of copying the shape instead of improving it.

Digits, the decimal point, and the operators go out as keypad keys, not as the number row. Some applications tell the two apart, so the distinction is worth keeping.

Each key also carries a second job, exactly as the hardware does. With Num Lock on you get digits. With Num Lock off the same keys become navigation.

• 7 and 1 become Home and End
• 8 and 2 become the up and down arrows
• 9 and 3 become Page Up and Page Down
• 0 and the decimal point become Insert and Delete

The Num Lock light is read, not guessed

A phone has no way to know how you left the host. So the app does not assume. It reads the lock-state report the computer sends to its keyboards. That lights the small indicator inside the Num Lock key.

When the lock is off, the navigation labels grow and the digits shrink. You can see what the next press will do without pressing it first.

Sometimes the host sends nothing on connection. The app then toggles Num Lock once, reads the answer, and toggles it back. Input waits during those moments. If the link drops before the restore is confirmed, the app says so. It reports uncertainty rather than inventing a state. Caps Lock is read from the same report — the keypad never changes it.

Pairing happens once

Open Bluetooth settings on both ends. Make the phone discoverable, then accept the request on each screen. After that the computer stays in a list, and reconnecting is a tap.

The same pairing serves the rest of the family. Type with Dotori Bluetooth Keyboard. Move the pointer with Dotori Bluetooth Mouse. Then enter numbers here. The computer is not asked to pair again. Each app introduces the phone with a compatible HID descriptor.

Keystrokes travel over Bluetooth to the host you picked. They do not reach the developer or the ads SDK. There is no companion server to install and no account to create.

What the host decides

The phone sends key codes. Everything after that belongs to the computer. The operating system decides. So do the active keyboard layout and the focused application.

This is why a keypad Enter may confirm a cell in one spreadsheet and insert a line in another. Neither behaviour is the phone's doing.

Requirements: Android 9.0 or newer, because BluetoothHidDevice arrived in API level 28. The app is free, with one banner at the top of the screen and no full-screen ads.

Wrap-up

A keypad is seventeen keys and a radio, and your phone has the radio. The layout matches the hardware, and the Num Lock light comes from the host rather than a guess.

Worth trying on the next long column of figures, before another small object joins the bag.