Some mobile phones have a built-in feature to lock the mobile to 3G or WCDMA only mode so that the signals caught by the mobile will be only 3G. Unfortunately some mobile manufactures won't include this simple feature in the settings. This makes phone signal change to GSM or 2G even there is enough 3G/WCDMA signal available.
So how can you switch to 3G only mode in your mobile? How could you get WCDMA only signals? Here is the importance of this app. This app access a secret code of your device and help you to get 3G signals.
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