A method of operating a mobile electronic device, the method comprising: monitoring, by the mobile electronic device, a power level of a battery powering the mobile electronic device; determining, by the mobile electronic device, that the power level of the battery is less than or equal to a battery power level threshold; performing, by the mobile electronic device, the following steps to enter a power saving mode in accordance with the determining: terminating, by the mobile electronic device, a first launcher running on the mobile electronic device; activating, by the mobile electronic device, a second launcher, wherein the first launcher and the second launcher are software programs that present links on a screen of the mobile electronic device for starting other software programs installed in the mobile electronic device, wherein the second launcher displays fewer application icons on the screen of the mobile electronic device as compared to the first launcher, wherein the second launcher displays a phone calling icon corresponding to a voice communication function and a text messaging icon corresponding to a text messaging function; degrading, by the mobile electronic device, one or more display characteristics of the screen, wherein the display characteristics comprise brightness, display resolution and/or refresh rate; disabling, by the mobile electronic device, a core of a CPU in the mobile electronic device; scaling down, by the mobile electronic device, a CPU frequency of a CPU in the mobile electronic device; powering down, by the mobile electronic device, a graphics processing unit, GPU, in the mobile electronic device; lowering, by the mobile electronic device, a GPU frequency of a GPU in the mobile electronic device; and disabling, by the mobile electronic device, one or more notifications on the screen, wherein battery level, received signal strength indicator and clock notifications remain enabled on the screen. monitoring, by the mobile electronic device, a power level of a battery powering the mobile electronic device; determining, by the mobile electronic device, that the power level of the battery is less than or equal to a battery power level threshold; performing, by the mobile electronic device, the following steps to enter a power saving mode in accordance with the determining: terminating, by the mobile electronic device, a first launcher running on the mobile electronic device; activating, by the mobile electronic device, a second launcher, wherein the first launcher and the second launcher are software programs that present links on a screen of the mobile electronic device for starting other software programs installed in the mobile electronic device, wherein the second launcher displays fewer application icons on the screen of the mobile electronic device as compared to the first launcher, wherein the second launcher displays a phone calling icon corresponding to a voice communication function and a text messaging icon corresponding to a text messaging function; degrading, by the mobile electronic device, one or more display characteristics of the screen, wherein the display characteristics comprise brightness, display resolution and/or refresh rate; disabling, by the mobile electronic device, a core of a CPU in the mobile electronic device; scaling down, by the mobile electronic device, a CPU frequency of a CPU in the mobile electronic device; powering down, by the mobile electronic device, a graphics processing unit, GPU, in the mobile electronic device; lowering, by the mobile electronic device, a GPU frequency of a GPU in the mobile electronic device; and disabling, by the mobile electronic device, one or more notifications on the screen, wherein battery level, received signal strength indicator and clock notifications remain enabled on the screen. terminating, by the mobile electronic device, a first launcher running on the mobile electronic device; activating, by the mobile electronic device, a second launcher, wherein the first launcher and the second launcher are software programs that present links on a screen of the mobile electronic device for starting other software programs installed in the mobile electronic device, wherein the second launcher displays fewer application icons on the screen of the mobile electronic device as compared to the first launcher, wherein the second launcher displays a phone calling icon corresponding to a voice communication function and a text messaging icon corresponding to a text messaging function; degrading, by the mobile electronic device, one or more display characteristics of the screen, wherein the display characteristics comprise brightness, display resolution and/or refresh rate; disabling, by the mobile electronic device, a core of a CPU in the mobile electronic device; scaling down, by the mobile electronic device, a CPU frequency of a CPU in the mobile electronic device; powering down, by the mobile electronic device, a graphics processing unit, GPU, in the mobile electronic device; lowering, by the mobile electronic device, a GPU frequency of a GPU in the mobile electronic device; and disabling, by the mobile electronic device, one or more notifications on the screen, wherein battery level, received signal strength indicator and clock notifications remain enabled on the screen.