LONDON--(BUSINESS WIRE)--RingCentral, Inc. (NYSE:RNG), a leading provider of cloud business communications solutions, today announced that BT Cloud Phone, in association with RingCentral, is now widely available to BT Business customers in the UK. “We provided BT a turn-key solution that required very little upfront development and integration. This enables them to address the growing demand for communications in the cloud among business customers,” said Vlad Shmunis, founder and CEO for RingCe