I received an email today from Amex for Birthday gift cards with no purchase and activation fees till 11/30/2012.

How does Citi , Chase and Amex treat these purchases?

And

1. I got the Amex Hilton card with min spend of 750 in 3 months ...to maximize the points its says 6 points on super markets and drug stores. Can I buy gift cards( gas ,amazon , restaurant ) from safeway and CVS with the amex credit card card or amex gift card with out raising any flags?
I got the 2 Citi Hilton Visa Signature cards with 1500 spend on 6 months ..can i use the same trick of buying gift cards at super markets to meet n maximize the spend..

And thinking of using both the cards for paying internet and wireless at@t bills...Is there any way to prepay in advance for Comcast or At&t?