[Blindtlk] cell phone problems and question

[Sarah]

Hello everyone. I have had a refurbished Samsung Jack from AT&T for six months. The phone runs mobile speak for a smart phone. I have had some problems with the phone lately. The volume of the screen reader often changes while reading information. Also, while reading text messages, the phone often reads a message that I think I am then replying to only to discover I have replied to another message I received. This problem occurs frequently and can be embarrassing. Could there be a problem with mobile speak or the phone? My previous phone also had mobile speak and I did not have this problem. What can I do to solve this problem? AT&T was not willing to work with me on this. 
    I would also like some information about the iPhone 4S. Is it accessible enough for someone that is totally blind? Sighted family members that have  the 4S say it isn’t. If I purchase this phone, would it be accessible enough without the need to then purchase a braille display or an external keyboard to use with the phone? Thank you. 
    Sarah