Why can't I use "Call up" here?

[Enlearnercn]

English Grammar Tests, Elementary Level

ESL/EFL Test #86 "Common English Errors (2)", question 6

......... me as soon as possible. It's urgent.

(a) Phone call
(b) Call/ring
(c) Call up
(d) Telephone call

English Grammar Tests, Elementary Level

ESL/EFL Test #86 "Common English Errors (2)", answer 6

Call/ring me as soon as possible. It's urgent.

Correct answer: (b) Call/ring

Your answer was: incorrect
Call up me as soon as possible. It's urgent.
_________________________

Dear Sir,

why can't I use Call up here?

Thanks in advance

Enlearnercn

[Linda]

It's customary to use "Call me or Ring me."
If you want to use 'up' then you have to change the place of 'me' in the sentence.
For example, "Call me up as soon as possible." is OK.
But, "Call up me" is not used.
Linda

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