There are factors you need to consider here that can determine the answer, such as the type of damage, how old the Samsung phone is, and whether the phone is still working well. If the phone has minor damage and cost is a factor you need to consider, then repairing it is cost-effective.

So if you have a screen lock, it might be tiresome for them to check the phone with the lock. It's generally not recommended to provide your passcode to a phone repair shop unless it's absolutely necessary for them to complete the repair.

Yes, a phone repair business is generally a profitable one. However, you still need to consider several factors since these things always impact the overall outcome. For instance, since your potential revenue is $1.44M per year with a gross margin of 90%, you can recover your investment within 9 months or even less.

Good Repair Shops should not wipe or access data / ask for passcode. You'll want to make sure that the repair shop you choose doesn't wipe or access your data without your permission or ask for your passcode. When handing over your Android phone to a repair shop, it's crucial to protect your personal data.