Support How to? Ringtones and radio

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http://androidforums.com – On my old phone I had some custom ringtones, and was able to set group ringtones: I had one ringtone for contacts in my phone, and another ringtone for callers who were not in my contacts list. This helped me differentiate between specific people, people I know, and people I may not know. Q: how do I do the second and third setting for known and unknown contacts? ----- Is there a way to turn of the phone radio when necessary and only receive text msgs? ie disable phone? (General)