Old paranoia filled post left below for reference. Thanks to saaaaaam for pointing the above link out.
----
There's something going on here, political or technical.
O2/Telefonica subcontracted out a lot of their core to Huawei in 2012 [1]. Literally today, after their CFO was arrested in Canada [2], we've been hit with a massive telecoms outage here in the UK which has taken out data / SMS. O2 have stated that it's due to one of their technology provider's software [3].
Edit: Giffgaff (virtual provider) have also stated that this is a global problem which is even more worrying [4]
I hope this is a coincidence.
We've had data down here in UK from 0500 to 14:00 so far...
China stock is falling, this happened, Huawei already have a somewhat iffy reputation and now BT is throwing out news about jumping ship from them suddenly.
[1] http://telecoms.com/44197/huawei-wins-managed-services-deal-...
[2] https://www.bbc.co.uk/news/business-46465768