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BARCELONA–Airtel has 250 million customers in India and Africa, but very few of them can afford smartphones, and Chief Executive Sunil Bharti Mittal said that’s holding the countries back. In developing countries, lower-end feature phones today are being used for banking and buying as well as for communications, but smartphones could offer much more, Mittal said at the Mobile World …

BARCELONA–Think your wireless network provider is hard-nosed today? Just wait. Although executives for these operators are tired of being seen as the bad guy, they’re also willing to take stern measures to defend their businesses, several said today at the Mobile World Congress show here. That means that Internet companies, governments, and mobile phone customers must pay up. “We’ve become …