Do I need to buy a smart phone for my Sec 1 or a normal phone will do? I am worried whether he will get addicted to games and texting.

It's really up to you. Obviously kids would prefer to have one due to peer pressure because his friends would probably have one. Maybe you can get the phone but limit his usage by getting one of those prepaid SIM cards? That way, if he finishes his data or sms limit for the month, he can't continue to use the phone. This will help your child learn to manage his time and in essence, money better.