diff --git a/lib/phony/countries.rb b/lib/phony/countries.rb
index d5b77793..5c1d7ac3 100644
--- a/lib/phony/countries.rb
+++ b/lib/phony/countries.rb
@@ -432,6 +432,7 @@
           match(/^([7-9]0\d)\d+$/)            >> split(3, 4)    | # Mobile
           match(/^(81\d)\d+$/)                >> split(3, 4)    | # Mobile
           match(/^(91\d)\d+$/)                >> split(3, 4)    | # Mobile
+          one_of('20')                        >> split(3, 3..5) | # 2-digit NDC (area code 20) - must come before 1-digit '2'
           one_of('1', '2')                    >> split(3, 3..4) | # Lagos, Ibadan
           one_of('9')                         >> split(3, 4)    | # Abuja
           one_of((30..79).map(&:to_s))        >> split(3, 2..3) | # 2-digit NDC
diff --git a/spec/functional/plausibility_spec.rb b/spec/functional/plausibility_spec.rb
index ea19d85b..98eba941 100644
--- a/spec/functional/plausibility_spec.rb
+++ b/spec/functional/plausibility_spec.rb
@@ -411,7 +411,8 @@ def self.it_is_correct_for(country_name, options = {})
                                              '+234 811 234 5678',
                                              '+234 64 830 00',
                                              '+234 1 280 444',
-                                             '+234 85 123 456']
+                                             '+234 85 123 456',
+                                             '+234 20 123 456']
       it_is_correct_for 'Niue', samples: '+683  3791'
       it_is_correct_for 'Oman', samples: ['+968 24 423 123',
                                           '+968 25 423 123']
diff --git a/spec/lib/phony/countries_spec.rb b/spec/lib/phony/countries_spec.rb
index dd73f4c5..e1ec7be4 100644
--- a/spec/lib/phony/countries_spec.rb
+++ b/spec/lib/phony/countries_spec.rb
@@ -1296,6 +1296,9 @@ def self.it_splits(number, expected)
     describe 'Nigeria' do
       it_splits '23411231234', %w[234 1 123 1234] # Lagos
 
+      it_splits '23420123456', %w[234 20 123 456] # Area code 20 (7 digits)
+      it_splits '2342013438806', %w[234 20 134 38806] # Area code 20 (8 digits, from Z2 ticket #14715836)
+
       it_splits '23445123456', %w[234 45 123 456] # Ogoja
 
       # mobile numbers