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I'd like to check the manufacturing date of an Xperia Ray. The easy way is by looking at the sticker under the battery, but I'm trying to convey this to a potential seller, and I would prefer something that doesn't involve taking apart the phone. I've read on Yahoo answers that *#9999# should do it, but it's normally a Nokia service code so I doubt the accuracy. I've also found *#*#4636#*#* (info) and *#*#7378423#*#* (service), which may have what I need inside of a menu. Can anyone give me a more reliable answer?

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Xperia™ Function Tester App

I would suggest trying this official application to find out the information you needed.

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I think this is the same as one of the codes (which though?). I would need confirmation that the production date is mentioned. –  Tobu Feb 2 '13 at 17:14
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Not sure this method reliable or not. Analysis of IMEI numbers Input IMEI, then check against Est. Date of Range Issuance. –  Ivan Chau Feb 3 '13 at 5:44
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