i have a friend who has just got iphone 4 on f/w 4.1
although i read that limerain will jailbrake this after trying it states its done but after rebooting theres still no icon there to install cydia

anyone confirm this will work or is there another option i can try

thanks

it does work

i jailbroke 4.1 with limerain. If its not there go to the icon for limerain and there should be an option to install cydia in there

Yep as said above - I jailbroke mine with limera1n no problem too.

PS the iphone/ipod touch/ipad firmware is due to updated to iOS 4.2 any day now. Make sure you don't update until it's confirmed the jailbreaks work perfectly on it.

im not even getting the limerain icon to be able to install cydia all though its telling me jailbrake was done

I'd recommend going with greenpois0n rather than limera1n. They both use the same exploit but greenpois0n is a lot stabler for a lot of people.

http://www.greenpois0n.com/

Do a restore to 4.1 with itunes then jailbreak straight away etc.

ok, i got the icon now but when i click on it, its says loading availble sorces, then states please check internet conection, he has a dongle for internet so no broadband, do i need it connected to wi-fi for this to work

It must be timing out due to the slow connection. If you can get somewhere with wifi then that'll be great, but if you can get a good 3G connection then it should work too (obviously he'll need a data plan of some sort).