Q: having issues with activating an iphone5c from at

i need help and advice on how to or what to do with this issue / problem i had just recently got a iphone5c from at&t and is trying to get it activated on the straight talk network and so far on the straight talk website the whole activating the iphone process went very well and on straight talks end they say the  phone is now active & ive done the whole turn the phone off then turn it back on thing and after the iphone turns back on i then go though the selecting your language then your country then choosing & connecting to your home Wi - Fi network but its right after that step when i go on to the next  part where my issue / problem is / lays is where it says that it might take a few minutes to activate your iphone and so i wait for it to activate but instead of it doing so i keep on getting this annoying messge saying cant activate the iphone due to the activating server being temperorarily unavalible try connecting your iphone to itunes to activate it or try again in a couple of minutes and if this problem persists contact apple support