My phone is dead and the O2 site is no help at all

[Anonymous]

The screnn went blank and won't turn on again. I want to speak to an O2 person but they are never there when you need them, so frustrating

[Cleoriff]

Hi @Anonymous Not sure what model of iphone you have..but you can force a restart. This article covers this for many models of iPhone...

https://support.apple.com/en-gb/HT201412

"To force restart an iPhone 6s and earlier, iPad, or iPod touch: Press and hold both the Sleep/Wake and Home buttons for at least ten seconds, until you see the Apple logo"

[MI5]

You may be better off contacting Apple directly to have it checked out.
http://www.apple.com/uk/retail/geniusbar/

[jonsie]

I will endorse contacting an Apple store rather than go to O2's repairers. Unless you are within the first 28 days for a faulty return.