d1

it could help if you understand the effectiveness of the features 
the battery life of a mobile phone, laptop, tablet and mp3 are almost the same they would normally last about 3-4 hours at least but they may run out a lot faster if you get a iPad,iPhone,mac,iPod.

p7

you can contact some people mobile phone by sending a message 

1.  click on to your contacts
2. then go down your list to find the contact that you want
3. then click on send a messge
4. after you wrote your message you can click on send
5. then you have send a messge