My galaxy s4 Mini gt19190 just goes on and starts again over and over what could be the problem

Liz, below are links to forums,trouble shooting and your manual to help solve your problem.
PRESS THE HELPFUL BUTTON

http://forums.androidcentral.com/samsung-galaxy-note-4/518445-5-0-1-notification-bar-icons-lock-screen.html

Galaxy S4 lock screen options and customisation

Top 50 Samsung Galaxy S4 Tips and Tricks

http://images.comparecellular.com/phones/2002/Samsung-Galaxy-S4-mini-i257M-user-guide-eng.pdf

To turn off
Powering down , then back on should do the trick. Be sure to completely down. Do not select "restart". If you still have problems, remove back cover and pull battery from device. Leave the battery out for about 60 seconds, then place the battery back in, assemble the rear cover and start the phone again.
Some galaxy s4 models may require you to press and hold the volume down button during start-up in the same manner as enabling it to exit safe mode.
http://www.technipages.com/samsung-galaxy-s4-turn-safe-mode

Try this link: http://www.android.gs/how-to-sim-unlock-samsung-galaxy-s4-for-free/

your IMEI is the Same number on the BOX which is your serial number for your phone

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I have 2 sgh-m919 galaxy s4 s from TMobile. Both phones were randomly showing the message "sim card not detected restart" and phone would reboot.. sometime would have to reboot 2 or 3 times before i was normal. I tried many of the net poste solutions including paper on sim card, clear cache, new battery etc. Nothing worked

This week i was ready to buy a new phone.. but was sure the phone wasnt the problem. I started deleteing apps one at a time and found the problem. It is GOOGLE MAPS !!! G0 into settings / more / application manager / slide over to all/ down to Maps /clear cache/ uninstall updates / force stop. Then turn off phone and restart. When you go to use maps or waze again when it asks for permission "decline" it will still work and you wont see the sim not detected restart message again.. Google the words google maps crash or reboots and see how many phones crash. Galaxy s4 happen to have the dialog box that makes it appear to be a hardware problem! Googles motto use to be "First do no harm" please reply if this works for you

Good luck!

Download the manual here: http://www.samsung.com/latin_en/support/model/GT-I9192ZWLTPA-downloads
GALAXY S4 Mini Duos

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all type function of samsung galaxy s4 mini