SMS contacts mixed up - due to similar phone numbers?

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http://forums.androidcentral.com – Hi there, I've had my Galaxy S3 for about 9 months, and 2 weeks ago started having this problem (I don't recall changing any settings etc that coincide with this timing). Two contacts have numbers which are only one digit different (ie, 04AXXXXXXX and 04BXXXXXXX). I've had these numbers stored in my contacts since the start, and contact both of them regularly. Two weeks ago, this is what started happening. When I receive an SMS from person A, the notification correctly identifies person A. Then when I click on the notification and go to the message app to read the full SMS, I am taken (HowTos)