Nokia X2 DS Data trouble [Closed]

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Registration date
Thursday March 5, 2015
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Last seen
March 5, 2015
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Hello,
Anyone help me pls...,
Scince last week my phone worked successfully, but now my data speed is slow. Usually I use data to Sim1 but now it takes longer time to download, the speed about 160kbps, but when i connected Sim slot 2 using same sim card connection speed reach to about 5.6mbps, tell me why this happen.

Thanks...