I had an iPhone 3GS with textnow and upgraded to iPhone 4 and redownloaded it. I didn't have a pw for my textnow account so when I tried to use the textnow address to log in to my iphone 4 it said i couldn't. so i made a new account. but then i was able to go back to my iphone 3gs to set up a pw. now i want to log in to my iphone 4 using my original textnow account but I don't know how to LOG OUT of a textnow account on the iphone 4 so I can log back in using my original account. Please help, i don't want all my contacts having to switch numbers to stay in touch with me.