Seems like a phone problem. Probably it's time for a new one. If you have this one for many years already, you'll be amazed at what they can nowadays.
Earlier this morning, received one of my few sms. Without thinking, just picked up my mobile phone, and just went to read it, pressed the correct button, and suddenly, the screen went blank, and I was unable to read anything, and nor was I able to switch it off or on. The only way I can turn it 'off', is to remove the battery. Taking out the battery, waiting some hours, putting the battery back in and turning on the phone achieves the same result--the blank screen. The only hint of 'life' is the faint flickering that goes on.
Is this a problem with what: the phone itself? the network? In all the years I have had the phone & used the network, this has never happened before Could it be a virus? Anyone here had any such experience before?