One of the differences that's been highlighted between the two latest heavyweight mobile devices, Apple's iPhone and the Nokia N95, is the fact that the iPhone doesn't handle MMS messages. If you've noticed that your phone does them but you've never used them, now's the time to get yourself introduced!

MMS is multimedia messaging service. Which, never mind that—it means you can send pics and video and STUFF in what is more than just an oversized text message. It's a feature that's been a part of S60 for a long long time, but there are plenty of people who never use it. For shame! It's one of the more entertaining things a phone actually does.

To use it, just open messaging and create a new multimedia message. Key in your text, add a picture or sound or video, or even more than one, and then hit send. Alternatively, if you're viewing a picture, you can hit Options, select Send, and Via Multimedia Message. You'll notice this popping up in context menus whenever you're viewing or listening to something that can be sent by MMS.

So, here are the quick hits for Why You Oughta Use MMS If You Don't Already:

- A picture really is worth a thousand words. And if you're the type that wants to write a thousand words on your phone, I don't know what else to say to you.

- Show someone something you're shopping for, map directions, the spot in the park where you're waiting for them to show up with a picnic basket, a diagram you need them to see, a picture of the gang you're with in the pub as incentive to join the party (or deterrent, depening on how long you've been in the pub) or your facial reaction to their last SMS. If you need to show them something instead of describing it, MMS really works.

- It's instantaneous. You don't wait for a person to get to their email or to see them in person to show them on your phone. Just snap a pic and it's off.

- News and radio channels often have MMS numbers (or email addresses). If you happen to snap the right shot of an event, why not send it to your local news?

- Send to another phone or to an email address. Just key in an email address instead of a phone number. Even if you don't need to send any multimedia, this can come in handy if you haven't gotten around to setting up email on yoru phone but need to send a message to someone's email address.

- Many S60 devices come with a little application called "Muvee" in it. I'll be posting on that one later and I'll let you explore that one on your own for now, but it's been one of my favourites for sending something to really brighten up a person's mood. Simple, big on the personal touch, and extremely silly.

- Nothing says "I love you" like sending someone a new ring tone. It's possible with MMS.

- MMS is another simple way of uploading photos to a photo community like flickr or to a blog. Many of these places allow you to upload photos via email. Well, MMS can send to an email address, so it works just fine!

Not working?
First off, if your MMS messages aren't sending, it may be because you don't have the proper settings in your phone. If your phone didn't come with the settings already installed, try out Nokia.com support (quick links to settings if you live in the US or in Europe... otherwise just go to your region's support pages on Nokia.com and look for Settings). Another factor, which seems obvious but isn't to everyone, is that the person on the other end has to be able to receive MMS messages. If their phone doesn't handle them, your network provider will often use another solution, such as forwarding a link by SMS to the message.

What have I left out? I know that a large percentage of mobile-savvy people still never bother with MMS, but the criticism (too difficult or inconvenient) is really unfounded IMHO. It's all in good fun, and occasionally really useful.

By now most of us are pretty familiar with the concept of group lists or mailing lists with email, and it only makes sense that this should also work on your phone.

In S60 phones, this is pretty easy. If you select any of your contacts, you'll see the option "Add to group" pop up in the menu. Or, from the contacts list, just hit the navigator key to the right to access your groups. This makes sending out mass SMS messages a lot easier if there's a bunch of people you frequently send messages to at the same time - whether that's for work, your baseball team, or "I love you" messages to all of your red-hot lovers (that'll probably get you in to trouble soon enough, though). Another nice feature is that you can use your contact groups to start up a Push to Talk call, if that's something you have from your operator.

Also, you can assign ringing tones to your groups, so you know whether an incoming call is from your center fielder or from a hot date. If you're dating your hot center fielder, I'm not sure which ring tone you'll get, but I invite you to try it out. :)

Some people have so many contacts that they sometimes get this Laura mixed up from that Laura or, even worse, forget who people are entirely. One solution that some people use with S60 phones is to organize their contacts into groups, so you get a bit of extra help in sorting which person is which. Just create a group for business projects, or your baseball team. Or, of course, your red-hot lovers. Might want to use a code word for that one.

"Good memory, but short" is something they say here in Helsinki, and I have a feeling it applies mostly to Great People You Met At A Party Last Weekend & You'll Never Ever Remember Their Names, Ever. This sort of thing happens to me a lot, it seems—I have a theory about my meeting a lot of people and my brain basically doing social memory triage and deleting tonnes of names and faces really shortly after hearing and seeing them in order to maximize the chances that I'll remember where I locked my bike, or what my own name is, etc.

But anyway there's something in S60 that really comes in handy when you meet a lot of people: assigning pictures to your contacts. What you do is snap a shot of the person, and when you get their name and number, set that picture to be their thumbnail. When they call you (or when you call them, or just look at their entry in the contacts) you'll see a little avatar-sized photo of them. This works great when about a week ago you were at a party where there were a lot of new people, or a conference where you met a bunch of new potential business contacts.

There are two ways to do it: when editing the contact details, choose "Add thumbnail" and you'll open the phone's gallery, where you can select the photo to use. Or, if you're browsing your pictures, you can select a photo, choose Use image > Assign to contacts.

I was all set to blog Jaiku today only to find it's in the air: Darla Mack's got an entry on the new Jaiku WidSets widget. But hey, it's Jaiku—the more the merrier.

Jaiku is a web and mobile place where you post sort of miniature, casual, in-the-moment messages. You know all those trivial must-share moments like "suddenly smell childhood summer in the air" or "best lunch ever"; the moments you don't really need to blog (and shouldn't) but you're sure have some place in the universe? Jaiku is the place for them. A lot of people might find that they've got quite enough communication with their friends and internet strangers already, but I rather like Jaiku. You can post and read your friends' posts from the Jaiku S60 mobile app. The interface is simple, and the application is blissfully nonintrusive: I was using Twitter for a while until I realized I was going crazy with constant SMS updates. But you can open the Jaiku applilcation whenever you want to take a peek at who's doing what.

It also has a bunch of nice features from the web and mobile worlds: it can grab feeds when you do other social stuff online (such as post pics on Flickr or post to your Blogger blog), and setting all of this up is incredibly easy. If you like, Jaiku will display your availability based on your phone's profile: a green light if your ringer's on, a yellow light with a note "shhh!" if you're on silent, and a red light if your phone is off. And, as you can see above, you can also add a snippet of code to display your updates on your blog (if you're feeling hardcore, I guess). All in all, they've done a great job with the features and it's still totally simple to use.

It's really built for mobile, too: I don't spend all my life in front of a computer (despite what my friends say), so really, a "light blogging" application like this should go with you. And it should be simple enough to use that you can post in twenty seconds and forget about it. Jaiku fits this bill, at least. Like all social applications, it's great if a lot of your friends are on it, and also if you've got a bunch of acquaintances there, too. Last weekend a friend posted an impromptu call for brunch, and it turned into a mass gathering with lots of new people being introduced.

Two caveats about using Jaiku on your mobile, though: you'll have to get used to recharging ye olde battery a little more frequently, and of course it uses mobile internet, so you pay for data transfer (but seriously, folks, if you're going to use internet applications on your phone, do go for a fixed-rate data service from your operator). Okay, three caveats: it's kind of addictive, too.

Anyone else? What do you use? Are you sick of social software on your mobile, or do you have to convince all your friends to sign up before you get into it yourself?