This is where fabric holders could come in handy.
Here,Sewcraftymeon YouTube will show you just how simple and easy it is to make even for beginners.
Materials:
Directions:
Step 1
Print out thepattern hereand cut it out.

Image Credit: Sewcraftyme via YouTube
Repeat the process on the lining fabric, cut out the two pocket pieces using the pocket pattern.
Sew around the small rectangle, make notches on the corners then proceed to notch all around the rectangle.
Push the lining piece through the rectangle and turn them right side out, pull properly, and press.

Easy To Sew Fabric Mobile Charger Holder
