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| Problem | Solution | |---------|----------| | Won’t turn on | Charge for at least 15 minutes | | No sound | Check volume level & Bluetooth connection | | Bluetooth not pairing | Turn BT off/on or restart device | | Buttons unresponsive | Press and hold Power for 10 sec to reset | foneso f100 user manual work
: Allows you to add or subtract consecutive measurements sequentially without clearing your primary layout. This public link is valid for 7 days
Capture the Length, Width, and Height successively by pressing for each line. The total cubic volume calculates instantly. Indirect Pythagorean Theorem (2-Point & 3-Point) Can’t copy the link right now
| Hidden Feature | How to Activate | Manual Reference? | |----------------|----------------|-------------------| | Engineering mode (network test) | Dial *#*#3646633#*#* | No | | Quick battery percentage view | Press Menu + Volume Down together | No | | Disable charging sound | Folder .nomedia on SD card (create empty file) | No | | FM radio without headphones | Not possible – uses headphone wire as antenna | Yes (but not the workaround) | | Hard reset (factory) | With phone off: Vol Up + Power → Wipe data/factory reset | Yes (but buried) |