Using Imei Number To Track Lost Mobile Phone & Physical Features Of Mobile Phones
4.10. Lost Cell Phone Tracking
Losing the device itself is bad enough, but there's a good chance that you'll lose your contacts and text messages, since they're not backed up anywhere-particularly if it's a regular cell phone. BlackBerrys, iPhones, and other smartphones may also have your private information stored in their apps. Replacement cost is another issue.
First, write down your phone's IMEI, MEID or ESN number (it's on a sticker under the battery, and which one you have varies by phone) somewhere safe. That's a unique identifier you can give to the police or your wireless carrier if your phone gets lost.
If you have any AT & T or Sprint phone, you can sign up for the network's child-finder service.
If you have a Verizon Wireless feature phone, you can use Verizon's Family Locator service for $10/month. Verizon's system doesn't work with most of the carrier's smartphones, though.
All the carrier-based services need to be activated before you lose the phone, because you either need to reply to a text message or change some settings on your phone to accept tracking.
Android phone owners can load up the third-party program Mobile Defense which offers not only phone-tracking, but remote lock, backup and wipe services. It's currently in a free public beta.
Apple iPhone owners that subscribe to MobileMe can use its Find My iPhone feature. This will bring up the phone's current location on a Google Maps screen. If you can't find the phone or will never be able to access it again, you can also kill the phone remotely; that will take effect the next time the phone sees AT&T's cellular network.
If you don't want to sign up for MobileMe you can also use the third-party tracking app iHound, but it relies on fooling a thief into launching it to send your stolen phone's current location back to you. That's a little clumsy, but it's a lot cheaper than MobileMe.
BlackBerry users can try the third-party Berry Locator ($6.95) which will send a message to your lost BlackBerry and show you where it is on a Web-based map from any PC.
Windows Phone owners can use Microsoft's My Phone. Microsoft's synchronization service lets you locate a lost phone, but not in the way you think. Unlike MobileMe, it only shows you the phone's location the last time it synchronized your data over the air. Locating your phone costs $4.99 for three tries. S-Mobile Systems' third-party parental control app gives you a more accurate fix, but it costs $29.99 and may be overkill.
5. Physical features of mobile phones
5.1. Electrical specifications for Charger
Most mobile phone chargers are not really chargers, only power adapters that provide a power source for the charging circuitry, which is almost always contained within the mobile phone. They are notoriously diverse, having a wide variety of DC connector-styles and voltages, most of which are not compatible with other manufacturers' phones or even different models of phones from a single manufacturer.
Users of publicly accessible charging kiosks must be able to cross-reference connectors with device brands/models and individual charge parameters and thus ensure delivery of the correct charge for their mobile device. A database-driven system is one solution, and is being incorporated into some designs of charging kiosks.
Mobile phones can usually accept a relatively wide range of voltages as long as it is sufficiently above the phone battery's voltage. However, if the voltage is too high, it can damage the phone. Mostly, the voltage is 5 volts or slightly higher, but it can sometimes vary up to 12 volts when the power source is not loaded.
5.2. Form Factor and weight
Over the years the relative screen size difference has increased. The difference between the smallest (128 x 128) and the largest (800 x 480) is now a factor of 23. That means the largest screen is 23 times bigger than the smallest one.
You can see that the smaller screens have a portrait orientation and the large screens have a landscape orientation. Between them are the phones that can change orientation, they can work in both landscape and portrait. 240 x 320 is the dominant screen size overall.