Kenneth bought a new phone and added two of his friends' numbers to his phonebook. However, he forgot to transfer the phonebook from his previous phone beforehand. Help Kenneth keep the most up-to-date phone numbers for all his friends on his new device. That is, if there is a number saved on both old and new devices for the same friend, you should keep the number saved on the new phone; or if there is only one phone number for a friend, you should keep it, regardless of which device contains it.

How to launch an app: steps to be successful? launching an app is a great idea, but it’s not that easy as we supposed to think. the majority of mobile applications don’t generate revenue because companies aren’t ready to be competitive. referring to our experience in successfully building and launching apps we hope to you omit these difficulties. we are going to talk about ideas, marketing, testing your product, its development, distribution and support. you will learn 8 product launch stages to succeed.