Import SMSes from Nokia 6300
An accepted solution is described with the question How to move contacts and other data from Symbian to Android? -- which might be of special interest to you, as it covers the transfer of other data as well. The SMS Migrator tool described there does, according to its description...


  4 steps to migrate / import / transfer / move SMS from Iphone, 
  Window Mobile, Symbian (Nokia), BlackBerry, Sony Errison, 
  Samsung, Siemens, and so on to your Android.


A step-by-step guide can be found on the product's website.