If you want to read all the messages on a progia, you have to go through and open each one individually. That takes a lot of time and makes it frustrating to look through old messages/paydata.
You can use "input list all messages with phone" to open the itemized list of messages on the phone. It then prompts you for a number of the message you want to open. However, it only lets you open one message at a time.
My suggestion is, make it so that you can input a range of numbers to open up multiple messages at one time. For example, inputting 1-5 should show you the first five messages saved on the phone.