My SIM doesn't work

[Miguelfernandes]

2 weeks ago I bought my New Sony Xperia Z3. Everything worked fluently, until this morning. When my SIM is inserted my Phone says ' no signal'. So I wanted to check if it was my Phone or my SIM. But sadly it was my Phone can someone explain how I can fix this?

[Thommo]

Maybe a stupid question but did you buy retail or from a 3rd party as some from 3rd party's can often be blocked by the networks because of unpaid bills by the seller, Example I buy a contract but stop paying then the phone included in this contract can be blocked

[Miguelfernandes]

I paid the bills. And my SIM is working on another Phone so I don't think that's the problem... What should I do?

[Thommo]

Either return your device to the place of purchase or contact Xperia care and have your device inspected http://www.sonymobile.com/global-en/support/contact-us/