Simple - Vlookup_If_Left_with muliple categories

[STEFAWN]

Hello,
I'm trying to categorize a number in a cell for example 4557808818 the formula I'm tying to write is =if(left(a1,1=4),"airbill",if(left(a1,1=5),"online" etc. what is the correct format o write this so it reads the first digit f a string and categorize it?
thanks

 

[mrshl9898]

=if(left(a1,1)=4,"airbill",if(left(a1,1)=5 etc.