Is the 300min Plan Good?

Does the i870 sends messeges faster than the i860. I aslo notice that it takes a long time to send a text messege on my i860, sometimes people dont even get the messege that i send. Will buying the i870 help improve any or theses problems that i am having like the clicking noise when i am talking on the phone, and the text messeging?
 
Will the i870 still send messeges if i close the phone? Is the software different from the i860, like the lay out of the different programs on the phone, are there more up to date?
 
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