long arm

— n

1.  power, esp far-reaching power: the long arm of the law

2.  make a long arm  to reach out for something, as from a sitting position

3. connection                                                                                    

long leg

— n

cricket

a. a fielding position on the leg side near the boundary almost directlybehind the batsman's wicket

b. a fielder in this position

Thus, it is wrong to utter an expression like that:

I used a long leg to get the job.

rather say,

I used a long arm to get the job. 

It is wrong to say "I am hearing you" while on phone. 

Say, "I can hear you".