I bought a pair of 3GS iPhones for my wife and I in June 2009.
Since then, I have been trying to make the most out of mine and supplying my wife with tips for hers, and I think I’ve now reached the point where it’s worth sharing some of my lessons with others, so here we are my first three tips (more to follow):
1. Buy each App once, then use on multiple iPhones
My wife and I use the same iTunes account across multiple computers. I have also logged each iPhone into this iTunes account. What this means is that I can buy an App from either iPhone or the iTunes Store on any computer and then share it with the other iPhone.
For example, I can download an App onto my iPhone and then plug it into any of my computers and right-click on the iPhone’s name in iTunes and select “Transfer Purchases” and then all my Apps that aren’t already on that computer are transferred onto there. I can then plug a different iPhone in and sync Applications to get those Apps.
Note that syncing your applications should always be done from the same computer, unless you want to end up losing your Application Data. So my wife always syncs her iPhone with her laptop and I always sync my iPhone with my laptop. But we will often plug our iPhones into both laptops to share our purchases.
2. Turn off Push Email to improve battery life
Go to Settings -> Mail, Contacts, Calendar -> Fetch New Data
Turn “Push” to OFF and set “Fetch” to Manually
3. Send videos/photos to each other via Email
When you are viewing a video or photo, you can choose to “Email Video” or “Email Photo”. If the video is too big, the iPhone lets you trim it right there on the phone. I recommend using Wi-Fi to send large files.
For retrieving what’s been sent, if you set up something like Gmail on your phone, then you can instantly check that email to see what’s been sent to you.
To send multiple files at the same time in a single email, you can go to Camera Roll and click on the bottom left icon and then click on multiple thumbnails (which puts a Tick on them) and then you can choose to Copy them all. Now open up your Mail App and Paste into the email body and then send.