Sync archive sms online and are websites which allow you to save ur contacts online absolutely free,

these also allow to backup ur sms online , my question is which mobiles apart from window mobiles support this feature like any symbian mobile can do it also ?

There are company's provided softwares which allow you to save your sms and contacts. No need to use any online service. I use PhoneExplorer for my Sony Ericsson.

chk this out

a detailed tutorial regarding the same you have mentioned above