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Samsung Galaxy s3 neo 3g issue

I bought Samsung Galaxy S3 Neo (Dual SIM) (Released in April 2014),

Now I am facing very strange problem, I am unable to use the 3G technology. My Telecom(Ufone Pakistan) Providing the 3G services, but whenever I try to select the WCDMA option from Network Settings then Network Signals goes off from the top signal indicator location
(Locked circle Like this image https://encrypted-tbn3.gstatic.com/...wCH82zQ8dqBKDq3Ss4ZfI4mv0CNaMQhTx9ghYGpXTXWE1)
is shown. Although simple GSM(Edge and GPRS) working very fine, Can any one tell me that what can be the reason ?
 

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