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You can check the phone specifications and accordingly contact your service provider. Phones are manufactured keeping in mind the cellular network operating specifications of a particular country/region. Probably the following link might help you understand about the cellular network operating frequencies: Wiki - Cellular frequencies


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The letter R means that you are roaming. You are out of your mobile provider home country or you are roaming while using a virtual mobile provider. Some providers that don't has his own network can cause that your phone shows a roaming signal, dependent of your phone firmware.


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As you say that the problem exists only on 3G and not on WiFi, this is probably because of some problem with the Access Point of the your network provider. I faced a similar issue sometime back which was because the default access point had a proxy which didn't allow SSL Tunneling. After removing the Port and Proxy from the access point, this problem got ...



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