I just had the same thing happen to me. Now before I get berrated by the snarky replies that have overrun this thread, I will say that I was not high
or drunk when this happend and was standing next to several other people who saw it as well.
I'm an American who was living in Thailand and bought a simple Samsung phone. Nothing smart about it... doesn't even have a camera. I bought the
Thai sim card and used it regularly for 6+ months. In the past 35 days, I have been traveling outside of Thailand and removed the sim card about 2
weeks ago so that the battery didn't drain. I now use the phone regularly as a clock and alarm.
A few hours ago, my pocket started vibrating and I heard the familiar ringtone of an incoming call. I pulled out the phone and it said "unknown
caller." Curious, I picked up the phone. Complete silence. I asked the usual questions: "hello, is anyone there? Hellloooo? Who is this? Is this a
ghost?" I showed the phone to the people I was with and it spooked everyone out.
After a minute or so - with the cell phone counter running - I hung up the phone. Naturally, I was curious, so I tried to see the recent call log.
"Please insert SIM card," it says. Same thing when I tried to hit send, which would normally call back the last number that called me. Basically,
the phone won't let me do anything that resembles making or receiving a call without the sim card in it.
Yet there it was, an incoming call of silence from an unknown number. About an hour later, my phone rang again. This time I was walking down the
street and didn't get to it in time. I wish I had, as I would have just left the phone on and hoped someone said something. It hasn't happened
since, but this was all just within the past few hours. Again, I have no way of even seeing that there was a missed call or a received call, because
the phone has no SIM.
This was not an alarm. My alarm is a completely different sound. It was an actual call, which I answered, as I'm sure did the OP.
I'm at a complete loss. I'm not a particularly superstitious man, but the believer in me would like to think that it's a long-gone relative trying
to get in touch. I don't believe that it's an emergency number. I'm in Taiwan anyway, using a Thailand cell phone. Who would be trying to make an
emergency call then stay silent when I pick up?
I even took a photo of the phone when the call was going.
Now I would love to hear your ideas that aren't "you were drunk" or "I can't believe you hid under the bed, what a moron."