When your iphone keep talking and you can't do any thing right, I had this problem and when I wanted to select a application I have to hold it first for few second then triple click to it once it selected by box type select button, then how I return to normal mode is as following:
1) Hold to slide to unlock
enter 3 times to get in to unlock
2) make sure you turn your phone from available setting to Airplane mode - then you will have no any reception but it allow you to see all thing under setting,
then go to GENERAL SETTING - select ACCESSIBILITY - click on VOICEOVER - OFF ( TURN OFF )
Once you turn off voiceover then you can use as normal iphone.
And be happy to use it again...
Take care
Mark K