import contacts from sim to phone only
In the contacts menu do you have a menu item called accounts? It should show which accounts are synched up and also have the option to not sync to any account. You could turn sync to accounts off here and may then be able to import contacts to phone only.

Alternatively you could make sure the phone is not connected to the internet (wifi or data), import the contacts into one of the accounts, then go into settings and switch sync contacts off for both the accounts available.