Lost mobile with imei no

I hope you contacted your service provider to prevent them charging you for all the calls the finder/thief is making. We can't help you here other to recommend downloading software in your next 'phone to make it possible to trace it and remotely delete your personal data.

I use Lookout on my Android 'phone but there are many others in the Play Store. Those facilities may not have been available to you on your Nokia but your new 'phone will be more up to date.