I have received over 50 text messages a day every time I use my phone r get a call I receive a text message. It's driving me crazy.

I have received over 50 text messages from this number today. The text is as follows:
eeeo0k[!ua]A;[[5;7gK'/Q;?5oC?KQueeL

I have received at least thirty text messages from this phone number and the call back number appears to be the last person who has called me or that I have called.  They occur at random times day and night.

Samething got a text telling me to call my GF at work, thought it was an emergency

I also jsut recieved a text from this number telling me to call the last person tat called me. Im not a criket customer either i have centenial. Very Creepy

Most likely its a Tapping device to let the 50 know who calls you  some one called me under private at 4:52 AM woke me up and then i get a text from this number and it Tells me one of my contacts, Probly who called me idk, but my brother called me today and i ignored it and i got another text from this number with His name on callback so i figure it's a reminder that you missed a call in text form, Cricket just Wants to kee it a secret and there testing its capabilities.

I got a call from 304-884-7069. I didn't answer my phone. I then immediately got a text from (600) 500-0015 telling me to call 304-884-7069. I replied with Why? I then got a text from Cricket saying the message could not be delivered because it was not a wireless device.

This happens when somebody attempts to contact you and it didn't go through.  It may have been that the service was busy; you were on the other line and didn't click over, you were just sending a txt msg, getting online, or dialing somebody on your phone and caused them to not get through.  When they reach your voicemail they are given the option to leave a callback number or an actual voicemail message.  When they leave a callback number its sent from the generic number of (600) 500-0015.  Hope this helps everybody.