About security 252
Protect against harmful apps 253
Make sure your phone can be found 254
Lock and unlock phone 255
Set a screen lock 255
Quickly tighten lock screen security 257
Set advanced lock options 258
Stay unlocked when connected with a trusted device 259
Unlock with your face 260
Unlock at trusted places 261
Keep phone unlocked while it's on you 262
Use fingerprint security 263
More security & privacy 265
Pin an app screen 265
Lock SIM card 266
Safety & emergency 267
Prepare for emergencies 267
System 270
Use multiple languages 270
Keyboard 271
Customize the keyboard 271
Change keyboard apps 273
Performance 274
Open apps faster 274
Back up phone 275
About phone 276
Record your IMEI number 276
Find legal and product information 277
Fix issues 278
Hardware issues 278
Phone is slow or unstable 278
Phone feels warm or hot 279
Phone won't turn on 280
Phone restarts or crashes 281
Screen is frozen or won't respond 282
Screen displays wrong colors 283
Screen brightness automatically too dim or bright 284
SD card issues 285
Call and SIM issues 287
Troubleshoot issues with calls 287
moto e15 viii