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You have poor 3G network coverage. Settings > about phone > status > signal strength
Signal Strength
| -67 dBm | Minimum signal strength for applications that require very reliable, timely packet delivery. |
| -70 dBm | Minimum signal strength for reliable packet delivery. |
| -80 dBm | Minimum signal strength for basic connectivity. Packet delivery may be unreliable. |
As you can see, the problem is your network coverage.