Remove PhoneNumber.

[zingimmick]

No description provided.

[codecov]

Codecov Report

Merging #27 into master will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff             @@
##              master       #27   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity        50        50           
===========================================
  Files             15        15           
  Lines            139       139           
===========================================
  Hits             139       139           

Impacted Files	Coverage Δ	Complexity Δ
src/SmsNumber.php	100.00% <ø> (ø)	1.00 <0.00> (?)

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