Inside our country Bangladesh Grameenphone Ltd is among the Multinational Telecommunication Company in our country. It was a terrific opportunity for me for being an intern in Grameenphone for ninety days. The formation of the internship program can be efficient. 900 is most favored frequency band inside Bangladesh. Fewer employees use GSM-1800. A dual-band 900/1800 phone is necessary to be compatible with virtually all operators. At least your GSM-900 band need to be supported to be compatible with many operators. Grameenphone makes use of both GSM nine hundred & 1800. Somewhere they employed multiband and a place used only individual band to supply their subscription.