Life without a cell phone? Cannot imagine! They are so important that it's as if they are part of our body. But many times cell phone batteries gets discharged while doing some urgent work, call, doing business over a long time etc. Power bank is a solution but again it needs charging and carrying. We made a circuit by which a cell phone battery gets charged while we are working on the phone either by calling or similar work. A copper wire loop and germanium diode along with dc booster and lithium charging modules are used. When the cell phone is used to make a call that time strong cell phone signal radiation gets trapped in wire loop and germanium diode produces voltage between 1.75 to 2.25 V, which is boosted to 5 v by dc booster module and then to a lithium charger module. The output of the charging module with enhanced current charges the cell phone battery. The circuit and possible internal arrangement in the cell phone are shown in the illustrations.