I know you're supposed to trust the techs but incase they check out your pictures, contacts etc..
The techs at PC World, Bristol checked out Gary Glitter's pictures.
BBC News | UK | Glitter jailed over child porn
When taking your phones in for anykind of service do you guys Harderest your phones first or does it even matter?
A very good question, and for me it all depends on the circumstances.
I've only had to send a phone away for service once, but the phone was completely dead so couldn't reset it anyway. Given the chance, I think I would hard reset it and clear all personal and private info. Chances are the techs could well factory reset it anyway, which will certainly happen if they're changing the logic board. I'm thinking of the sort service where the phone will be sent away for a few days or weeks, and may well even be replaced completely. If it's just a local tech. it's a five minute job while I wait and the phone is not out of my sight, e.g. a broken screen or changing an iPhone battery or something. I probably wouldn't bother. I dropped a Lenovo phone a couple of years ago, busted the glass, local tech had to order the part in, took a couple of weeks to get the part, but he repaired it while I waited and watched him doing in. Same with the Oppo phone I've got now, the Oppo service agent five minutes walk from where I live. One of them knows me personally, I taught his boy English.
Didn't even need service, just popped into say, hello.
Service directory that's built-into Oppo phones:
I trust them with my personal data no problem, but then they're not likely to be sending the phone away. If they couldn't repair it, they'd replace it.