Q: My iphone4 feel vy hot during calling on 7min and before this no this kind of problem,hot esspsially near the battery location,high temperature on aluminium there!

When troubleshooting temperature, please refer to the following article:

iPhone, iPad, and iPod touch (4th generation): Keeping device within acceptable operating temperatures

http://support.apple.com/kb/HT2101

When using the device or charging the battery, it is normal for it to get warm. The exterior of the device functions as a cooling surface that transfers heat from inside the device to the cooler air outside.

By all means, if you believe the temperature is a concern, you can isolate the issue by restoring your iPhone as new:

iTunes: Restoring iOS software

http://support.apple.com/kb/HT1414

Thanks,

Matt M.