App is stuck installing on my iPhone, how do I fix it? I started updating my Twitter app, but then I lost the internet connection and when I went home I couldn't get it to resume the installation. It stops just past the half way mark with the lines on the icon. It has been like this for months.

How can I unstick the stuck application install?
You mentioned this device was upgraded from iOS 9. In my experience an iPhone that has been upgraded from previous OS that has not had a full restore on it in years is prone to reliability issues like this.

I typically do a restore at least one time per year (I experiment a lot and "cruft up" my phone).

Its a pain however its probably time for a full restore...  The phone will run like new afterwords.



Note: Back up all data before you preform this action, otherwise all data will be lost.