Cell phone? Cell? Mobile phone? What's the "correct" term?

What's that type of phone called that you don't need a cable for and you can use everywhere in the world (provided there's coverage ;-))?

And what differences are there between the regions? USA/UK/AUS etc... and even within, say, the US (or even UK). I've even read rumors that in parts of the east of the US, people use the term "handy" (which is a really crazy German "Americanism").

EDIT: Clarification: The colloquial usage is more interesting (to me) than the "correct" official terminology (though that's of interest, too).

In the UK, we use mobile and/or phone, and perhaps even mobi/moby (though I've never seen it written that way outside text messages.

In the US, I've heard of cellular phone/cell phone/cell, and in Germany they call them handies (which still makes me chuckle for no good reason).

In Australia, it has traditionally been a "mobile" - never a "cell" (unless you are deliberately trying to sound American!).

However, it is increasingly becoming just a "phone", as landlines continue to disappear from households. The one clarifying term might be "my phone" - this would guarantee it to be a mobile phone, rather than a landline.

Speaking from the technology perspective, naming is specific depending on the device characteristics, two main categories being landline and mobile.

Landline is a device receiving signal through a fixed phone line (which is not always a circuit; sometimes the device is a pretty large phone with a SIM making it quite mobile, sometimes handheld, still it's considered a landline phone).
Mobile phones have a couple different technology-dependent types:

• cellular (or cell for short) are called the devices utilizing signal received through a "cellular network"
• satellite devices are powered by the satellite network

These terms describe your device in respect to differences implied by phone networks, but the total of non-landline phones are mobile.

Also there are smartphones. This term distinguishes the device in a bit different dimension; it describes the capabilities as opposed to older handheld devices (smartphones are the devices that combine a microcomputer and a telephone).

So, strictly speaking, if you want to be specific to different types of devies you should use different terms in different cases. That would make a lot of difference if you wanted, per se, sell software for a particular kind of devices.