The mobicel astro device with me has an error when it comes to storage. My device has a 2gb internal storage because of it I had to delete important documents in favour of new important documents. I decided to buy a 4gb sandisk to compensate for the lost documents and try increasing the space but however the internal storage keeps sending notifications of storage space running out. What is this as I cant use my phone due to this notifications? I also dont have any apps downloaded except for whatsapp.