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Might want to get an external battery charger with it, as the connector to the phone may have been bent or broken, and you could still charge batteries with an external charger.
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
REASONS OF SAMSUNG GALAXY S4 NOT CHARGING- GREY BATTERY PROBLEM
The main reason of Samsung Galaxy S4 not charging- grey battery problem is a shorted charging port. There may be several reasons for it such as sometimes dust entered into the charging port and causes this problem. Sometimes the bar across the center of the charging port gets bent.
SOLUTIONS TO FIX SAMSUNG GALAXY S4 NOT CHARGING- GREY BATTERY PROBLEM
Method 1 If your Galaxy S4 falls and you start to face Samsung Galaxy S4 not charging- grey battery problem, then take a pointed wooden toothpick, a magnifying glass and a strong light and see carefully if any bar across the center of the charging port is in the center and not bent to touch one of the sides of the shell. If you find that it is bent then straight it using the toothpick point carefully.
Method 2 Look for the dirt into the charging port that it may pick up from anywhere. Take a thin needle and gently insert it in the charging port to take out the large piece of dirt from it. But you have to be very careful so that you do not make any damages of the charging port. You can do this by using a can of compressed air or dust/hair blower that will blow out the small dust particles from your phone's charging port.
Method 3 Some users reported that they have found solution of the Samsung Galaxy S4 not charging- grey battery problem by taking out the battery from the phone , insert it into another Samsung Galaxy S4 ,and then again put it in back.
So follow these steps to get rid of Samsung Galaxy S4 not charging- grey battery issue.
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