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I have a Nokia 2710c-2, once I do something related with settings when I come on the main screen, my network is loss! no provider name there and signal strength low for ever. I have to restart again to have network again. I went to store and they replace by another unit. This time, I enabled the flight profile, after a few time I come back to the general profile, the network recover rightly again. After 1h, I picked the phone and the same problem. The current sw version is V06.21, variant 142.01 and no new version on the website. Unlike other nokia phones I have, this software doesn't have any option to manually select 2G, 3G... network.