This is the first, most popular question, with which are constantly faced both mobile phone parts suppliers UK, as large service centers that provide repair services, and small workshops. Let's figure it out together.
The country of origin may have nothing to do with the originality and quality of the supplied products. A good example would be Apple, whose production of iparts and assembly of devices are geographically located in China. However, this does not affect the quality of products.
Any supplier can have both original cell phone parts wholesale (supplied directly from the assembly line of the manufacturing plant "signed" for the manufacture of this product for a given brand) and analogs (spare parts manufactured in compliance with all the necessary standards and specifications for this type of product by the developer, using original documentation, but in a third production facility that does not supply its products to an official assembler).
There is one more nuance associated with the use of analog spare parts - this is the constant withdrawal from the production of a wide range of products, due to the updating by manufacturers of old lines of devices and the launch of new ones. In this case, the only correct decision is to purchase the necessary analog spare part produced in the third production at an affordable price and within a satisfactory time frame, and not to manufacture the same exact spare part at a factory that previously serviced the assembly in a time exceeding reasonable and the cost is not comparable, and often exceeds the cost of the device itself.
All such subtleties, in any case, are obliged to
inform you and be sure to advise on possible options for cooperation.