HT201270: Update your carrier settings on your iPhone or iPad
Learn about Update your carrier settings on your iPhone or iPad
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Mar 18, 2013 9:10 AM in response to sariindahby RajaRani,iOS 4.2.1 is end of line for 3G.
Need to upgrade iPhone for the purpose (you have in mind) to at least 3GS, supporting iOS 6.1.2, as of date.