Support for LTE band 4 topic

The Verizon Samsung Galaxy S3(I535) has the Qualcomm Snapdragon S4 plus MSM 8960 processor. The Qualcomm MSM 8960 is capable of supporting LTE band 13 and LTE Band 4(AWS).

The S3 only supports LTE Band 13

Q1. Is there firmware that will make this device support LTE Band4(AWS) also?

Q2. Is there a SW to make VOLTE calls using the S3?

I am looking to unlock LTE Band 4(AWS) on my VzW GS3.

Thanks in advance,