Methods, devices and software enable uploading a file from a user equipment to an Internet storage service server via a mobile cellular network. A method includes (A) uploading sequential chunks of the file from the user equipment via a cell of the mobile cellular network, (B) sending a first message requesting to pause the uploading, to the user equipment upon receiving an indication that the cell is overloaded, (C) storing a length corresponding to the sequential chunks that have been uploaded until the uploading has been paused, and (D) sending a second message requesting to resume the uploading, to the user equipment. The user equipment pauses the uploading upon receiving the first message and resumes the uploading using an offset from the beginning of the file corresponding to the length upon receiving the second message.