A push by a coalition of telecom operators, device makers, and industry groups to bring $40 smartphones to market — a price point seen as key to getting tens of millions more people online — is gathering momentum, but questions remain over whether manufacturers can produce such ultra-low-cost devices at scale. This week at Mobile World Congress in Barcelona, the advocacy and lobbying group GSMA said it is working with major African mobile operators — including Airtel, Axian Telecom, Ethio Telecom, MTN Group, Orange, and Vodafone — and smartphone makers to pilot ultra-low-cost 4G devices in six African markets: the Democratic Republic of the Congo, Ethiopia, Nigeria, Rwanda, Tanzania, and Uganda, in a bid to make smartphones more affordable and bring an additional 20 million people online. Affordable smartphones are widely seen as key to narrowing the digital divide in developing markets, where millions of people live within mobile broadband coverage but remain offline, often because internet-enabled devices remain too expensive. Through its Handset Affordability Coalition, the GSMA is working with operators and manufacturers to …