20 Most Recent Pantech Sky Vega Lte Ex Im-a820l Lg U Unlocked Gsm 3g Korean Android Smartphone - Page 5 Questions & Answers

here is a link video solution for you hope it helps http://www.youtube.com/watch?v=NvWXxYXqHko

you need also the SIM code to unblock the SIM card. If is not this problem, than SIM is damaged or contacts for SIM card not proper. Try SIM card in another phone.

Problem is either with the charger or a bad battery.

its messing up calls its the error all the time please fix its error calls

No... taking it apart .. unless you KNOW what you are doing is not smart.. take the battery out.. when the sun is out and there is NO chance of rain..sit it outside in a bowl of uncooked rice.. it will dry out.. you might have to clean the contact surfaces where the sim card goes.. With the battery OUT.. use a magnifying glass (this is a tiny area and a tedious undertaking) and a long sewing needle to lightly rub the contact surfaces to remove any corrosion.. make sure the contacts are clean and reinstall the sim card and battery,,,

Take it to somewhere that specializes in fixing cell phones; a reliable company. They can tell you approximately how much it will cost.

company give u 6-month warranty of your phone battery so you have to go to service center to change your poor battery