THL W3 with v4.0.4 - periodically getting "Restricted Access Changed" and losing all SIM services
I had similar problem with my brand new Snopow M6 phone. And I'm sure, that this may be common to most Chinese Android phones. First, in Estonia we have 3 major mobile operators, and with SIM cards two of them my phone worked nicely, it did not work with my own SIM. Also tried almost everything, but then started check IMEI code through the operators' networks. And found out, that my operator follows the idea, that its not good enough just not to be in their blacklist, You have to be in their white list. So I gave them a call, and they manually added my phones IMEI to their white list and phone works flawlessly since then. So, if you buy a Chinese phone from the Internet, then first check Your IMEI through carrier, random internet sites might give You an answer, that phone is not blacklisted, but that might not be enough in some cases.