thank you so much for your quick response.
should i stay on windows phone 8.1 or update to update 1?
obviously its my choice, but i want to know, i heard that update 1 is dev preview, and there is no chance to go back, and i didnt use any gdr updates yet, thats why m asking this, will it give me same speed or it'll work little bit slower?
Around 1.5 GBhow to go back anyway? and whats the size of gdr1 ?
thanks..