Very recent...I thought I could do it when I first got my 6S, but it might have started then...not sure. Haven't made any changes to contacts or anything, and they're synced the same way they were on my 6 (Exchange). I can use Siri to text anyone in my address book....except my wife. I'm not talking just about 'Text my wife', which also doesn't work, but not because she doesn't know who my wife is (she responds in the error with her name). It also doesn't work if I just say to text (first name) or even if I do her full name. If I tell Siri "Text (wife's name)" I get the response "I don't have any phone numbers or e-mail addresses for (wife's name)." Her mobile number is in her contact info, as is her iCloud e-mail address for iMessage. If I ask to see the contact info for her, she brings up the correct record with all that information. However, nothing (even deleting and adding the phone number), seems to work. Most infuriating? If I say "Siri, text (555)867-5309" (real number omitted for obvious reasons), she'll respond with "What would you like to say to (wife's name)." Other contacts work fine, and I can call my wife with Siri...that works fine too. Any suggestions? Even deleting the contact and making a new one doesn't seem to work.