I think Prizm Institute is a very good institute to learn cell phone repair. It provides a very deep understanding of the entire concept for repairing mobile phones and tablets. All the trainers at this institute are very very helpful with deep knowledge of the subjects concerned.
They teach the students in a very systematic method which makes it very easy to understand. The notes they provide complement the training to understand the theory aspect. They teach soldering and desoldering in a practical way. All the other harware and software repair methods are explained in a very simple way such that the students can easy learn and understand all the topics. They concentrate more on teaching troubleshooting of faults like replacing screens and charging ports. Flashing and unlocking of phones is also covered in the training.
I think they also provide online cell phone repair training for people who cannot join at their school. This training should also be good enough as the institute conducts very good and systematic training. But I think it will not be able to provide hands on training which the classroom course provides.
Anyway, I had a very good time at the institute and I will always recommend Prizm Institute for the courses it offers.