maddy4 wrote:hey i just activated an iphone4. i have everything working except iMessage! other iPhones don't recognize me as an iPhone. my messages appear in green instead of blue! just curious as to why!
Make sure that you can browse internet via safari on your iPhone without WiFi. iMessage require internet connection, either WiFi or cellular. To enable iMessage your number need to be registered with Apple server. This is an automatic process. Go to settings->Messages and turn off and turn on iMessage. It may take a while to enable iMessage on your phone with the ST (AT&T) number. Some time it take hours. If you are unable to connect to internet without WiFi, you need to install a profile by going to http://www.unlockit.co.nz
with your wifi connection. Follow the instruction on the phone and select Straight Talk as service provider from the list (if you have not done it already!)