The theory goes that the dry rice will draw out and absorb any water if a phone has been submerged but Apple said it is not more effective than allowing the device to dry in the open and that the rice particles could in fact damage the phone.
Apps which are put into background mode are paused in the phone's RAM which does not drain battery and allows them to easily resume. The phone maker said clearing background apps uses more charge as it drains battery when they reopen.
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