How can i get this IPhone 3G users !?

Crasihelpful!!

New member
I have an iPhone 3G 8 GB. so does my friend, but she is able to do things that I can't ! for example:
1. she can double tap on the message that she receives(while her phone is locked OR while she is using another application) and simply reply right to the message on there
2. let's say she's looking at her notes app. Barbara texts her and it shows up-my friend has the option to reply(right on her current app w/ out having to move to the texting app) , view , or close . HOW CAN I GET THESE FEATURES AS WELL? why does she have them and I don't we have the exact same phone . is it a certain update ? or what? thanks ! & be descriptive :)
 
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