What is the ruling on using the workplace internet for personal purposes, and what is the ruling on selling a program developed using this internet, and what is the ruling on the profits resulting from its sale, and what is the ruling on possessing the work phone after embarrassing the manager to obtain it?

The program you created is solely yours, and you are permitted to benefit from it, sell it, and earn from it. As for the internet data provided to you by the company, and the status of the phone, if the company has a right concerning them, then you must either return them, compensate their value, or seek their forgiveness. However, they do not share ownership of your program.

Regarding internet data, its ruling depends on your contract with the company or the agreed-upon custom: If it is specific to the company's work, you are not permitted to use it for personal purposes. If you did, you must seek the forgiveness of the company's management; otherwise, you must pay the value of the data used personally.

As for the mobile phone, if you mean that it was not given to you as a permanent gift of ownership, but rather as a loan for as long as you work with them, then it must be returned when they request it after you leave your job. If an employee gave it to you out of embarrassment and shyness without genuine willingness, then the phone was not permissible for you, and it should have been returned. It is considered like usurped property, for which repentance is obligatory, along with its return to its owner and guaranteeing its benefits.