[Major functions] 1. Missed calls or text messages(SMS/MMS) alert (basic) 2. Flash on Call 3. Find my phone 4. App message alert 5. Free collect call 6. Service pause 7. VIP SMS alert [Detailed description of each major function] 1. Missed calls or text messages(SMS/MMS) alert If a call is received but the user does not respond, the first notification is activated after the “start delay” time specified in advance by the user from the time when the screen of the smartphone is automatically t