Celkon
Celkon was a mobile phone manufacturing company in India based at Hyderabad. It manufactured dual-sim smartphones, feature phones and tablets. Its smartphones were sold under two brands: CAMPUS and a high-end series MILLENNIA. Initially its mobiles and tablet PCs were assembled in Taiwan and China. Celkon  started its assembly line in Medchal, Hyderabad with a capacity of 200,000 mobile phones and later set up two more units – one in Tirupati, Andhra Pradesh and other in Hyderabad, Telangana. 