Received an emergency text alert on your smartphone today? Here's what it means

NDMA and DoT conducted a live test of India's emergency alert system using cell broadcast on February 20 to verify public ...
来自MSN

Android Text Messages: What Do The Single & Double Check Marks Mean?

Android users who use the Google Messages app may have noticed a check mark or two below sent messages, but what do these icons represent? The Google Messages app isn't just an SMS and MMS application ...