We have talk about the amazing thing that the Nokia N900 is, about bringing a revolution on the mobile world and the integration concept. But now seems that having a full integration between your Nokia N900 phonebook and Skype, GTalk and other IM services has a dark side too.
Recently I have read a post were the writer warned about the Nokia N900 phonebook due to his experience. The thing is that when you delete a contact on your Nokia N900, you are also deleting it from all the IM services like Skype, GTalk, etc. But the Nokia N900 warned him about this by a message on the screen which it said: “Deleting contacts will also remove them from the server”. In that moment, the writer didn’t understand the meaning of the word “server” as the same way that the Nokia N900 meant. When he finished deleting the contacts was when he got it, the word server was referring to the IM servers, so all the contacts on his Skype and GTalk list disappeared (All this using the Delete Contact option, one by one).
Later he found the Delete All contacts option under the Settings options. And by using this option, it only deletes the contacts on the Nokia N900, not on the IM services.
I thought that it was a good idea to share this writer experience with our readers because it´s something that could happened to anyone and it’s better to prevent you from a big headache.
Here is the writer’s post if you want the full story.
“Tight integration with various Instant Messaging services (Skype, GTalk, MSN Messenger, etc;) is one of the great features of Nokia N900.
It’s super convenient. I crowed about it in my first impressions review of Nokia N900.
You just enter your IM login details, and all your contacts from them appear in the address book. It might take some work of merging these contacts, especially for the incomplete profiles, but then they are there, and when you want to talk to someone, you just have to select  how – Skype, GTalk, SMS, e-mail or phone call.
It just works, and changed my …

It’s not news that the Nokia N900 gives you the possibility of communicate avoiding using your carrier network due to the WiFi feature and the Skype and Gtalk and other IM apps on the phone. But using the first two through 3G network, it´s something I have to point out.
The N900 has among its integrated systems the Skype, meaning that the Nokia N900 hasn’t a Skype application installed. Even more, Skype is integrated into Maemo as method calls and contacts. This situation repeats for Google Talk, but what is more interesting is the possibility to make audio calls to contacts in Skype and Google Talk.
On a Spanish Blog called GizmóvilI, the writer tried this communication services under N900 WiFi network and Vodafone’s 3G network in Spain, with incredible results which he did not expect, making calls to your contacts using the network operator. We all know that the operators block VoIP protocols to avoid saturation of the nodes and this way, you make phone calls to pay their rates. Not with this terminal.
For the tests he’s done under WiFi and Vodafone’s 3.5G network he could make and receive Skype and Google Talk calls without problems, with a fairly decent quality audio but with some delay in the sound, less than a second.
As this writer says we are not sure how Maemo manages these calls, VoIP is assumed to be stopped by operator, but may not be so. Maybe the Nokia N900 uses another form of transmitting call’s data. What is certain is this: you can call Google Talk contacts and Skype using your flat rate data.
Here is the image where you could see the 3.5G logo on the top of the Nokia N900 screen.