Massive technology transformations are more and more challenging the way mobile telecommunications networks are designed and deployed. Beyond purely technological impacts, these transformations are also challenging business models and strategies, requiring both adaptability and timeliness. Many stakeholders from the Telecom industry value chain are attempting to take benefit from this shift towards softwarized and disaggregated networks, to promote or consolidate their business position. In this article, we examine existing and emerging business models (BMs) in the telecommunications ecosystem and analyze these findings to derive perspectives for Beyond-5G (B5G) and 6G networks.