Your phone may display an exclamation mark in a triangle on a black screen. This screen is called recovery mode, and is usually accessed from the bootloader menu on an Android device. The most common cause of issues with recovery mode is when the device has been rooted; or having installed a custom ROM.
How do I get rid of the triangle on my Droid?
How do I get rid of the triangle symbol on my Samsung? Hold down for a couple of seconds ‘only’ on the writing saying (mobile data) “not the icon itself! Turn off data saver. Triangle will go off.
Why do I have an exclamation mark on my messages?
It is usually that your message has not sent or maybe while sending a message your internet experienced lag or shut down. If your internet interrupts your messages your device may give out the exclamation mark. Check iMessages for any I sent messages.
Why is there an exclamation point next to my text messages?
Message not delivered: If you notice a red exclamation point next to a sent message, this means the message could not be delivered. There are several reasons for this, e.g. your contact has turned off his mobile phone or has bad or no reception.
How do I get rid of the exclamation mark on my text messages?
To remove any message that has a warning marker against it, the usual method is to hold your finger on the actual message text, and a menu will appear – now select DELETE on that menu. This method is the same for all kinds of Android, Iphone and Symbian mobiles.
What is a triangle with 2 arrows on my phone?
It is the data saver icon – switch it off from your settings and it will vanish (Thanks to OP for the link of Data saver) Source: Personal experience. https://android.stackexchange.com/questions/224997/what-does-the-2-arrows-inside-a-broken-triangle-notification-icon-mean-on-sams/224998#224998.