I can change incoming text message alert but it applies to all contacts how do I change for example 20 different sound alerts for 20 different people so I know who the text is from before answering
I'm not quite sure if there's such feature on Android by default. What you can do is use apps like Ringo: Ringtones & Text Alerts (link). Check it out. Let us know if that's what you're looking for.
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