Is stamping needed after H-1B is transferred?

[Bun123]

Hello,

I am no longer working for the company through which I got the visa stamped (Valid till April 2016). I had my H-1B transferred to a new company and got an approved I-797.

I am now planning to go for a trip to India and return to US after 3 weeks. 

 

Please advise on the following

 

1) Is it mandatory to go for visa stamping if I go to India? (even though the visa is valid till 4/2016)?

Because I am no longer working for the organization through which I got the visa stamped 

2) What are the scenarios in which we need to go for visa stamping (even when you still have a valid visa)? Would it be an issue, when filing for GC, if we don't have the visa stamped (even though we have an approved 797)?
3) When travelling back to US, is it sufficient if I carry only the approved petition with my new employer? Should I be carrying any other documents in addition to the approved 797 forms

Thanks

[USADreams]

You dont need to get passport stamped again . Carry along I-797 for new employer when you travel .