This is a continuation of the settings Field test from earlier.
Toggle ENS(reboot requirment):
In settings, there are switches ON and OFF. We've tried it in Lumia 625H, if it switch ON: in effect, all the settings will return to the beginning (after a reboot). If OFF: in effect, instead of ON ... is no change default settings after you.
For an explanation of default Limit SMS Storage and Toggle CMAS(comercial mobile alert system) RMT (reboot requirment), can visit: WP Forum/ http://forums.windowscentral.com/nokia-lumia-920/202396-lte-3g-toggle.html . Although not for Lumia 625H, yet little is beneficial for your knowledge.