Share your experience!
My Xperia Tipo Dual was not reading my second SIM. sometimes it was working and then suddenly it worked but for a few seconds. I read a post saying the SIM bay was not making good contact and the solution was to insert a piece of a business card paper to force it to make contact. I tried that and since then my second SIM is working perfectly fine!!!. No, I won't take it to the care center, there isn't one close to my location, Sony MUST send a fix and for it for free!
You HAVE to contact your local Xperia Care
http://www.sonymobile.com/global-en/support/contact-us/
why? Because this is a FORUM, for us, users, to help each other.
Also it seems that the problem its the SIM card, I've seen this before on other posts and the problem was that some carriers/network use a slimmer SIM card, in other words, those phones were just fine, the problem was the SIM card, that's not a Sony issue but a network/carrier issue.