What are the consequences for someone who works in cell phone maintenance, and these phones may be used for unlawful things, knowing that he does not sell or buy phones, nor does he upload any unlawful content onto them, but he may find unlawful content in them during maintenance, and his money is little and he cannot change his profession?

Selling and maintaining used devices, whether for good or evil, or for permissible and forbidden uses, is permissible if it is known or highly probable that the buyer will use them for permissible purposes. It is forbidden if it is known or highly probable that the buyer will use them for forbidden purposes. If the situation is unknown, one should act based on the prevalent use. If the prevalent use is permissible, then it is allowed; otherwise, it is forbidden.

Since the prevalent use of mobile phones is permissible, there is no harm in repairing them, selling their internal parts, and training workers on their maintenance, while observing two matters: 1. Deal with the device only, without the SIM card or memory card, to avoid viewing their contents. 2. If an obvious reprehensible act is encountered (pictures or videos), it must be removed as an act of enjoining good and forbidding evil, even if the owner of the device refuses, and advice should be offered to them regarding the prohibition of their action.