Why did your boss call you? You phoned in sick, unless he/she was calling to see how you were then fair enough. If he/she was phoning to see if it was genuine or not, then personally this breeches your rights. I frickin hate it when I am ill which is very rare 1 day a year if that for someone to call me ask you something. What if I am dead, who would you call then!?! Err hello i'm ill go away. You called in advised you were ill, you do not get paid for not being in so WTF. Don't worry about it mate. They sack you, then personally they sound like a bunch of sacks themselves. Tell them you propose to sue them for unfair dismissal. They called you outside usual working hours, how are they to prove you were at 'T in the park' during work hours and that you had not just got better in the afternoon and did not want your expensive ticket to goto waste. Then tell them to put that in there pipe and smoke it and walk out.