T-Mobile US and Sprint merger rumour of the day: it’s back on!

It is being reported that T-Mobile US and Sprint might be set to merge. This is only the 400th time such a move has been rumoured in the past few years.
The author of this latest rumour is CNBC, which has sources that say suitably generic things such as ‘talks are ongoing’ and ‘yeah, sure, why not?’ (see below). Apparently parent companies Deutsche Telekom and Softbank like the idea of a merger with the ascendant TMUS the dominant partner.
One of the many potential sticki