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I am really trying to grasp everything in all of these threads but do keep coming up to questions about all of the terminology. What would be the best place to decipher everything? I did some searching but could not really find anything summed up in one place. I have found various things scattered but it seems everything I think I understand something else comes up and gets me all mixed up again. It is hard to tell which terms are upgrades of same technology vs. a totally new technology. For instance I am trying to figure out PCS1900 vs CDMA in 800 band or 800SMR bands? I know the lower frequency typically gets through buildings better but where does the difference in PCS versus CDMA come in? Is CDMA800 the same thing as the SMR 850 but just a different frequency or is it totally different technology on different frequencies?