This is the EXACT reason i only give out my mobile number now
1 night it was just gone 12.00 ( midnight ) and we were all in bed, i had just started so my daughter was about 3 - 4 months old
the phone rings
them : Oh hi matt
Me : hmmmmmmmm hi
them : we have just got back from holiday today and notice you have cleaned our windows, we will post the cheque in the morning
Me : you do realise the time, i was asleep
them : oh i thought i would give you a ring
i hung up before i let them know what i thought of them
after that, its just my mobile, i know the argument for " you look like a pikey, you dont look professional , blah blah blah " BUT i dont think its held me back much and in this day and age where everyone has a mobile and they have access to me 24 / 7 ( they dont, but thats the opinion of a mobile ) , its worked for me and saved me having idiots wake up my family with silly phone calls