ASK
People just want to remember each and everything they come across especially their friends phone number, their account number, their ATM number etc. But very few are good in it. An easy way to do it is, put your total concentration on the thing you want to remember and suggest your mind that you will never ever forget this thing. Repeat the thing to be remembered quite a few times.
Remember, our mind will never forget things that is repeatedly said or remembered again and again.If possible link the thing to things that you can recall quickly. A boy will instantly remember a girl's name and phone number even without repeating it many times because his total concentration is in that fact and he mixes his feelings also to remember the name and number.
He will remember them even if he is told only once. Likewise we should put our emotion strongly to remember things or think of some picture to co-relate it to the thing to be remembered. This comes easy when it is practised.