Some contacts might come from overseas and do not have any phone number/have an overseas number.
The fact that a Singapore phone number is compulsory to enter might make it difficult to add any foreign contact into the contact list.
A good fix would be to warn the user if the phone number is not a Singapore phone number but still accept it. Do note that special characters should also be allowed for country code etc.
Some contacts might come from overseas and do not have any phone number/have an overseas number.
The fact that a Singapore phone number is compulsory to enter might make it difficult to add any foreign contact into the contact list.
A good fix would be to warn the user if the phone number is not a Singapore phone number but still accept it. Do note that special characters should also be allowed for country code etc.