Originally Posted by 94civicEX
Sprint phones must access the internet to send text. On older phones, you are unable to reply to a one-way text, these show up in your "Page/Text" folder and are unable to be replied to directly. Most carriers text messages will go into the persons internet inbox where they will be able to reply or do whatever with it.
So if the Sprint user is a subscriber, yes, they will be able to reply. They have to have Wireless Web, Vision, or a Short Mail subscription.
This is not completely true anymore. Sprint rolled out their new text messaging service a few months ago, but your phone has to be compatible with it. I have it on my Sanyo 5500 (aka Sanyo VM4500), and it's so much better because you don't have to sign on the web anymore, so it sends in like 1 second. As far as I know only the latest Sanyo phones have the software for it (Sanyo 4500, 5500, and 7200).