Cannot send iMessages or text messages
I have an iPhone 5S which I've had for a year, and now my phone will not send iMessages or text messages. My phone had a little fit later on today, constantly vibrating everytime I clicked onto my messages. That stopped after I reset it, but now will not send anything, it also won't send anything via whatsapp, and when I click on my apps such as Facebook and instagram, it just shows a blank screen and then switches back to the home screen. Can anyone help?
iPhone 5s, iOS 8.3