Spice has ventured into the Indian Mobile Handset Market with Dual Sim Phones, which make it convenient for consumers to carry two phone numbers in one handset. They have Dual Sim Phones covering two GSM networks, or two CDMA networks or one GSM and the other CDMA network.
Stimulated emission:- If an atom is already in the excited state of energy level E2 whose ground level energy is E1, at this moment, a photon of energy hn = E2- E1 is incident on the excited atom, the incident photon stimulates a similar photon from the excited atom.