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Dear Ingo,
I do not think any supplier (even for the factory itself) would be able to guarantee you a fully working phone. If any seller who makes such a guarantee to you, just be cautious.
This is because the main issue with this model is that it does not have a consistent problem from one phone to another and also from country to country.
One phone could have problem with JAVA, the other with Opera mini and some others may have totally no problem at all. Before we ship out the phones ,we would have tested that everything is working perfectly in China. However, when we send this model to various countries, they either come with different problems or no problem at all.
The only consistent problem that I can see that is that the video recording may not be as clear when played out as compared to the view that you have seen on the screen when recording.
Of course, if you face any part of the phone that is not functioning, you can always send back the phone to us under the warranty period and we will get the factory to rectify the problems for you. The repair which is due to manufacturer's defects will be free of charge. However, you will need to bear both ways shipping costs.
In any case, the Pinphone is currently out of stocks at the moment. This is because the factory has stopped production and will resume production after the Chinese New Year. We reckon that the next batch of stocks will be released only at around end Feb.
Please feel free to contact me should you need further clarifications.
Warm regards
Grand