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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


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.


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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