As part of its Uncarrier repositioning, T-Mobile is launching into the banking business with a pre-paid debit card and banking app. But if people aren't willing to trust banks with their cash, why should they trust a telecoms provider?

With the growth of digital, a new solution to retail banking woes is emerging. Hello bank! is the world's first stand-alone digital mobile bank that's accessible any time, any place – and, crucially, maintains a clear focus on customer experience.

Bank branding has tended to skew towards the masculine, rather than feminine. But Tink, a new start-up from Sweden is promising to change that with a mobile app that looks and feels more like Instagram than dull incomprehensible finance.

Despite having one of the highest poverty levels in the world, sub-Saharan Africa is the world leader in mobile financing. Mobile money transferring services are available in 36 of 47 countries in Africa, with more active accounts than anywhere else in the world.