Where can I leave my Smartphone and cheap repair?

Hey,
I'm looking for a cheap Service for my Smartphone, and I am here in the Net on this Online Service https://www.doc-phone.de/ encountered, and wanted to hear your opinion on this.
Already two times, it was the phone for the same reason, in the Service, and it always came back without the Problem fixed.
What interests me, however - how safe is it to send his phone so Post it to someone?

Thank you

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