In one sentence, describe what the following article is about:

Use a ruler to measure the length and width of your phone. Add 1 inch (2.5 centimeters) to each measurement. Cut two strips of duct tape based on your length measurement. Stick them down on a cutting mat, overlapping the sides until you get your width measurement. Flip the sheet over, and cover it with two more strips of duct tape. Repeat this step for the other sheet. Use a craft blade to cut off any excess duct tape. You will need two strips that match the length of your sheet, and two strips that match the width. Slice each strip in half lengthwise. You will have a total of eight strips when you are done. You can use the same color as your case, or a coordinating one. Place one of the shorter strips over one of the narrow ends of your first duct tape sheet. Make sure that half of it is sticking out over the edge of the sheet. Flip the sheet over, and stick the other half of the strip down. Do this for the remaining edges on both sheets. This will hide the raw edges of the sheet as well as reinforce it.
Measure your phone, then add 1 inch (2.5 centimeters) to each side. Make two duct tape sheets based on those measurements. Cut four strips of duct tape for the trim. Fold the trim strips over the edges of each duct tape sheet.