by contrast the number of fixed telephone lines decreased by about per cent as more people are opting to use only mobile cellular networks or bundled internet and voice services in developing countries where fixedline telephone services have been undersupplied and of poor quality in many locations the spread of mobile cellular service continues to be rapid having grown by an estimated per cent between and in developing countries accounted for only about per cent of global subscriptions to mobile services but by their share had increased to per cent between and mobile cellular penetration in developing countries surpassed the per cent mark and by end it had reached an estimated per inhabitants figure