You need to unlock your phone network with blackberry 7290 unlock code. This code can reset your phone network to default factory setting and you can purchase this blackberry unlock code easily at third party sites.
You have to turn on your wifi to get a network access...
SOURCE: manual network search
By going to the Options (Wrench icon) then Click. Scroll to Network, Click. Scroll to Network Selection, Click. A pop-up box with Change Option, click and choose Manual and then Save.
1- select your network manual in your handset
2-try another sim card ,so that your either there is problem in your sim card
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