In my case, the root looks like missing bolt on specific for iPhone,
even tho I have had many an iPhone for ages and not had any problems
previously (even changing tariffs) until ios9 update came along.Re: the
APN details, those were the ones given t...
Settings > Mobile Data > Mobile Data Network Mobile APN =
mobile.o2.co.uk (was idata)Visual Voicemail = mobile.o2.co.ukMMS =
WAP.o2.co.uk u/n and password stay the same (vertigo/******) Fixed it
for me.