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no because the mobile as design to have a capacity for for cover and only micro wave signal as effected b/w two deshes due to smaller wave length
Yes, To some extent depending upon the type of cover.
Signal strength can be reduced by using Headset as much as you can.
Before sleeping, make sure to keep the phone far from your body, and if possible, activate flight mode before sleeping.
As we have to avoid using the phone when the battery level is less than 10%, the signal strength register its highest level.
