Iphone 6 does not recognize the sim and the battery dies IF i do not keep it charger

Make an appointment at your local Apple Authorized Service Provider to have them take a look and provide you with your options. Alternatively, you can contact Apple Support directly by selecting the "Get Support" link in the upper right-hand side of this forum's web page.

• It's high time you get your iPhone battery replaced.
• SIM => How to unlock your iPhone for use with a different carrier - Apple Support