Compatible devices\uf0c1
Qin F21 Pro\uf0c1
The Qin F21 Pro is a compact “smart keypad” phone made available in 2022 by Shenzhen Duoqin Technology in China. It features a 2.8″ touchscreen, a physical keypad and Android 11. Marketed as an “ideal backup/work phone,” it appeals to users seeking a non-addictive, distraction-free device that still runs Spotify, Maps, WhatsApp, and similar apps.
The phone can be easily purchased on AliExpress from various sellers. If you intend to replace the system with Dumbdroid, we recommend getting the cheaper, non-Google version.
| Specification | Details |
|---|---|
| Display | 2.8″ IPS TFT (480 × 640 px, 286 ppi) |
| Operating System | Android 11 |
| Processor | MediaTek Helio A22 (MTK6761) quad-core @ 2.0 GHz |
| Memory & Storage | 3 GB RAM + 32 GB storage or 4 GB RAM + 64 GB storage |
| Battery | Li-Ion 2120 mAh |
| Cameras | Rear 5 MP; Front 2 MP |
| Dimensions & Weight | 132 × 53 × 9.5 mm; 100 g |
| Connectivity | 4G LTE (Bands B1/B3/B5/B7/B8/B17/B28/B34/B38/B39/B40/B41), Wi-Fi, Bluetooth 5.0, GPS |
| Colors | Black, White |
Doov R77 Pro\uf0c1
The Doov R77 Pro was released in early 2024 by Shenzhen Cwell Electronic Technology. Even though it was made under a different brand than the Qin, both phones come from the same manufacturer and are very similar devices. The R77 Pro has several advantages over the Qin, including a slightly faster CPU, two SIM slots, a better keypad, and a better location of the front camera. On the other hand this model lacks proximity and ambient light sensors.
This model is often sold under alternative names, such as R77C or R17 Pro. To make sure you are buying this device, look for the 2.8″ screen and the presence of cameras in the specifications.
| Specification | Details |
|---|---|
| Display | 2.8″ IPS capacitive touchscreen (640 × 480 px) |
| Operating System | Android 13 |
| Processor | MediaTek MT6762 octa-core @ up to 2.0 GHz; IMG GE8320 GPU @ 650 MHz |
| Memory & Storage | 3 GB RAM + 32 GB ROM or 4 GB RAM + 64 GB ROM; expandable via TF card up to 128 GB |
| Battery | Built-in 2100 mAh li-polymer battery |
| Cameras | Rear 5 MP AF with flashlight; Front 2 MP |
| Dimensions & Weight | 133.2 × 54.2 × 9.5 mm; 113 g |
| Connectivity | Dual SIM (Nano + Nano or Nano + TF); GSM/WCDMA/LTE; Wi-Fi 802.11 a/b/g/n/ac; Bluetooth 4.1; GPS/A-GPS/Beidou |
| Colors | Black, White |