yung first code po is to check the existing message centre number if it's not +639220001501 then dial po the second code.
yung second po is to change it to the correct one :)
Gumana na po sakin. Ginawa ko po for iOS.
Dial *#5005*7672# to check po ung message centre number.
Kung hindi pa +639220001501, palitan nyo po.
Dial **5005*7672#+639220001501# tapos pag confirmed na po.
Go to Settings > General > Reset > Reset Network Settings.
Then wait po mag restart phone...