I have tried to make skype calls from my handset (n900) to my contacts that use skype and i hear them for like 4 secs undisrupted then it breaks up on both ends.

I am using t mobile for my internet and other people I know use the same without any problems. I changed my phone to see it the problem would rectify but the same thing happens
.
Everything else works fine like the messaging, its just the calls that make don't work properly

Are you using Dual 3g/2g?

Are you in the UK?..... If so and you have the basic web&walk it won't work.. :-( due to them blocking it..

Also, if you are on O2 and have a data bolt on, if you use VOIP with mobile data (3G/HSDPA etc), you will be breaching your T&Cs and are likely to get a telling-off email.

what you need to do is upgrade to web&walk Max or Broadband Extra.. I had the same trouble.... B/Extra is about £12.50 extra a month. Works great after that.

yeah im from london. i use tmobile! im not sure if they have a faster web&walk, but i will enquire!!
i also use a duel connection... same problem, fine then cutting out. Annoying!!