You said:

Does Rossmann Repair Group repair iPhone screens and batteries, or only recover data? What should I do before sending a phone?

ChatGPT said:

Rossmann does more than data recovery. Their current site says they perform component-level iPhone repair, including logic-board work, but there’s an important distinction:

Screen/battery replacement: I would not assume Rossmann is the right place for routine screen or battery replacement. Their iPhone service is primarily centered on board-level/component repair and data recovery. Their own data-recovery page describes ordinary screen/battery replacement as the kind of “module-level” repair a typical phone shop performs. 
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Rossmann Repair Group
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Logic-board repair: Yes. They repair iPhone boards at component level, including faults that prevent the phone from powering on, charging, or being detected by a computer. 
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Rossmann Repair Group

Data recovery: Yes. For a dead or damaged iPhone, they repair the original board sufficiently to boot it and extract the data. They require your device passcode for this. 
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Rossmann Repair Group
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Liquid-damaged iPhones: Their site specifically says they treat liquid damage for data recovery, rather than repairing the liquid-damaged phone as a normal usable phone. 
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Rossmann Repair Group

Before you send an iPhone

Back it up first if it still works. If it can boot and you can unlock it, make an iCloud or computer backup before shipping.

Don't keep trying to power on a water-damaged phone. Rossmann specifically warns that repeated powering-up can worsen corrosion. 
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Rossmann Repair Group

Know your passcode. For data recovery, Rossmann says the passcode is necessary to decrypt the phone's data. 
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Rossmann Repair Group

Fill out their service ticket before shipping. Their current mail-in instructions say to include your device, a note with your name and ticket number, the passcode if locked, and your return address. 
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Rossmann Repair Group

Don't send unnecessary accessories. Their mail-in instructions say not to send chargers/cables, original retail boxes, or protective cases. 
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Rossmann Repair Group

Pack it securely. Use a sturdy padded box so the phone cannot move around or be crushed in transit.

If the phone contains sensitive information, consider what you are comfortable having technicians access. Data recovery necessarily involves accessing the contents of the unlocked device.

One wrinkle: Rossmann's site currently lists Austin, Texas as the lab for its mail-in data-recovery operation, while an older/store page lists a New York mailing address. I'd follow the shipping address generated by the current service ticket, rather than copying an address from an older page. 
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Rossmann Repair Group
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Rossmann's current iPhone data-recovery page

If you tell me what's wrong with your iPhone (e.g. cracked screen, bad battery, won't turn on, water damage, or you mainly need the photos/data), I can tell you whether Rossmann's service appears appropriate or whether you'd want a conventional iPhone repair shop instead.

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