Phone-Specific Troubleshooting

1. Follow steps to troubleshoot for your issue.
   • Sending messages
   • Receiving messages
2. Android phone's may have manufacturer specific settings that limit notifications from appearing until you open Signal. Use the following steps as guidelines to navigate through settings for your specific phone.
   • Asus/ZenFone
   • HTC
   • Huawei
   • Lenovo
   • Nokia
   • OnePlus
   • Oppo
   • Samsung
   • Sony
   • Vivo
   • Xiaomi / MIUI
3. Follow steps to troubleshoot for your OS.
   • OS-Specific Troubleshooting

Asus

• Android phone Settings > Battery > Auto-start manager > ensure Signal is enabled.

HTC

• Boost+ app > Optimize background apps > Signal > select 'Off.'

Huawei

• Android phone Settings > Apps > Apps > Signal > Power Usage Details > App Launch > Set to Manage Manually and enable these options: Auto-Launch, Secondary Launch, and Run in Background.
• Phone Manager app > Battery manager (or Energy Saver) > Protected apps > Enable Signal.
• Android phone Settings  > Advanced Settings > Battery manager (or Energy Saver) > Protected apps > Enable Signal.
• Android phone Settings  > 'All' tab > Protected apps > Enable Signal.
• Phone Manager App > Protected apps > Enable Signal.
• Android phone Settings  > Apps > Advanced/Special Access > Ignore battery optimizations > All Apps (drop down) > Enable Signal.
• Android phone settings > Battery > Launch > Signal.
• Android phone settings > Apps > Signal > Data usage > Background Data > Enable.
• Android phone Settings  > Notification panel & status bar > Notification center, find Signal and activate Allow Notifications and Priority Display.

Lenovo

• Android phone Settings  > Power manager > Background app management > add Signal to the unrestricted list or allow Signal to auto-start.

Nokia

• Android phone settings > Battery > Background activity manager > ensure that the switch is disabled for Signal.

OnePlus

• Android phone Settings  > Apps > Gear icon > Apps Auto-launch > Enable Signal start-up in the background.
• Android phone Settings > Battery > Menu > Aggressive Doze & App Hibernation > Disable this mode or prevent Signal from being limited in this mode.
• Android phone Settings > Apps > Menu > Auto Run > Disable this mode or prevent Signal from being limited in this mode.

Oppo

• Apps > Security center > Privacy permissions > Auto-run management (or Startup manager) > Enable Signal.
• Android phone Settings  > Application management > Running tab > Enable Signal.

Samsung

• Android phone Settings > Apps > Signal > Mobile data > Allow background data usage
• Android phone Settings  > Security > Auto-start management > Enable Signal.
• Android phone Settings > Wi-Fi > Advanced > Always keep Wi-Fi on during sleep.
• Android phone Settings > Device Maintenance > Battery > MENU > App Power Monitor > Disable or selectively choose apps to sleep from Settings > Device Maintenance > Battery. Make sure to exclude Signal from the sleep list.
• Android phone Settings > Device Maintenance > Battery > Power saving mode > Disable ot adjust to MID.
• Android phone Settings  > Battery > Detail > Signal > Turn off.
• Apps drawer > Smart manager > Battery > Detail > Signal > Turn off.
• Android phone Settings  > Battery > Battery usage > MENU > Optimize battery usage > select 'All apps' > Disable Signal.
• Android phone Settings > Battery > Unmonitored apps > Add apps > Signal > Done > Restart your phone.
• Samsung 8: Android phone Settings > Apps > Menu > Special Access > Optimize battery usage > select the drop down which likely states ‘apps not optimized’ and switch to ‘all apps’ > find Signal and tap on the switch to turn it off.

Sony

• Android phone Settings  > Storage & memory > turn off the 'Smart cleaner' option or continue to tap the three dots at the top right > Advanced > add Signal to the whitelist.
• Android phone Settings > Power management > Tap STAMINA mode > Apps active in standby > add Signal to the whitelist.

Vivo

• Apps drawer > iManager > App manager > Autostart manager > allow Signal to auto-start in the background.

Xiaomi / MIUI

• Apps drawer > Security app > Permissions > tap Autostart > Enable Signal.
• Android phone Settings > Services > Security > Permissions > Autostart > Enable  Signal.
• Android phone Settings  > Additional Settings > Battery and Performance > Manage apps' battery usage > turn 'Power saving modes' off > open the Security app > navigate to Permissions > add Signal to Autostart > invoke Task Manager > find Signal > drag it downwards until the padlock icon appears.
• Android phone Security app > Settings > Data usage > Allow background data.