Got your number...or so you thought!

A good friend of mine has just been caught out.

A few days ago i spotted the lad in question walking an old lady down the road.
How nice i thought, how can i wind him up?
A few hours later i sent him a 'hello, who is your lady friend' text.
I didn't hear anything for a couple of days which concerned me.
Maybe it was a sick relative, or maybe they had fallen?....
On my arrival at work today my chum was there, strange but a welcome sight.

"Did you receive my text"
"Yes mate"
"Oh dear, have i put my foot in it?'
"No, i sent you a text back, which was a tad dirty, only i picked the wrong number"
"hmmmm"
"Your old number now belongs to a 10 year old Irish lad"
"hahahahahahahahahahahahahahahahahahaha'

The poor lads angry mother phoned my friend to inform him of his error, errrrkkkkk.