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The post answers to your puzzle: how to restore samsung jack settings. how to reset jack factor default settings, hard reset on samsung jack, master reset on samsung jack, factory default settings for samsung Jack i637
For the purpose of reset the SGH-I637 (Jack), there are  two different methods to reset the factory settings, Master Clear (Erases user storage) and Master Reset (Erases the registry). These can both be accomplished thru the phone menus or using the handset buttons.

To reset the handset’s factory settings, via menus, follow the steps below:

WARNING: This Reset will Delete ALL added Data from the Handsets Memory
From the home screen, press the left soft key for Start
Press the left soft key for More
Press the left soft key for More again
Select Settings
Select More (7) to display more settings
Select Security (1)
Select More (7) to display more settings
Select either Master Clear (2) or Master Reset (3)
With Device highlighted, press the left soft key for Yes to confirm resetting the handset to the factory default settings

To reset the handset’s factory settings, via buttons, follow the steps below:

WARNING: This Reset will Delete ALL added Data from the Handsets Memory
When the handset is powered off, Press and Hold the 5 key then power on the handset
Press either the 1 key (Master Clear) or 2 key (Master Reset) at the Format Menu screen then press the Y key (Yes) at the confirmation prompt

Note: To turn the SGH-I637 (Jack) on or off simply Press & Hold the power button , located on the upper left side of the handset.

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