HT4972 why my iphone 3g is very hard to update??? please give me ways on how to update... my current version is ios 4.2.1

why my iphone 3g is very hard to update??? please give me ways on how to update... my current version is ios 4.2.1

An iPhone 3g cannot be upgraded beyond iOS 4.2.1.  That is the final iOS release for the 3g.  You would need to purchase a newer iPhone if you want to run any higher iOS release.
An iPhone 3Gs can run up to iOS 6.1.3 but not beyond that.
An iPhone 4 would be the minimum older model to be able to run the current iOS 7.0.4

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