Skype launches a minimal rival to iSkoot with a Java client for mobile phones. Caveat data plan for the download, but voice goes over the cellular network so it shouldn't be too bad.

Haven't finished testing Skype for your mobile yet, but the J2ME downloads are popping for Nokia, Motorola, Samsung, Sony Ericsson. Voice (in, out, Skype-to-Skype) only enabled in Brazil (Rio de Janeiro), Denmark, Estonia, Finland, Poland, Sweden and UK.

Marjolein Hoekstra via twitter:

I just installed the brand-new beta of Skype for Java-enabled mobile phones. I'm so excited!

First impressions of Skype Java version: it can't load all of my 268 contacts. Incoming conversations aren't opened automatically. Fast.

New Skype Java has three columns: Contacts, Chats, Events. To change column view, press right arrow.

Offers incremental search (just type).

It seems Skype Java only allows one conversation to be open at a time. Incoming chat messages are accompanied by a loud audio signal.

On installing Skype Java you'll first be prompted to enter a mobile number. Only then it asks if you want to receive incoming calls at all.

See also:

• jkOnTheRun: "I like this concept much better than the dedicated Skype phone, like the one from Netgear I reviewed previously. I'm betting however, that the carriers (at least in the U.S.) won't like the idea as much as I do."
• Symbian-Guru: Ultra-Hot: Skype For S60 Finally Available! "Wow, this is hotness. The application isn’t 100% ‘VoIP’, as it still requires a cellular connection to make a call. However, chat works over WiFi or cellular networks, as does receiving calls. When you go to initiate a call, the Skype application calls a local number, which then connects you to your contact, regardless of where they’re located. It’s a rough start, but it’s a start, nonetheless. File transfer is not present"
• nokiAAddict: NEW: Skype Mobile Beta (skype in/out & chat) "I’m currently with 3uk network and get free skype to skype calls in a similar way, but don’t get skype in/out or chat. I’m just hoping 3uk release a new version very soon. I’ve tested the chat and it works fine."
• Villu Arak's blog news release. 
• Some screenshots.

From the Skype web site:

Skype for your mobile beta means you can call your contacts whenever you need to – no computer, WiFi zone, or special phone needed.

• Works on almost 50 handsets, with a data plan.
• Costs just a little to make and receive calls.
• See when your contacts are online.
• Instant message or call them using Skype.
• Save on mobile calls to friends and family overseas.

Skype for your mobile is a mini, beta version of Skype that you can download on to your mobile. You don’t need to switch operators or get a specialised phone. The software is free – although there might be a small data charge from your operator if you download it straight to your mobile.