Audio and Connectivity
Sound capabilities of the Celkon C51 included a loudspeaker and a 3.5mm audio jack, accommodating those who preferred listening to music or calling hands-free. The phone lacked advanced connectivity features such as WLAN, modern Bluetooth versions, positioning, and NFC. However, it did come with an FM radio, which was a valuable feature for entertainment and information without the need for internet access. The Bluetooth 2.0 version allowed basic wireless connectivity for compatible devices, and microUSB provided wired charging and data transfers.