To add to this, what is described is called Shared Source, not Open Source or Libre Software. Microsoft does shared source with numerous governments and universities, but your placing complete trust in the vendor that the code they show you is what is in their distributed binaries, esp. with how many compilers output different binaries when recompiled with the same code.
The only way to even start considering any of the current telecom vendors (including Huawei, NSN, etc) as not malicious is to have them offer their code under a libre license that bars tivoization, otherwise there is no guarantee that you can load the firmware they gave you the source to onto the LTE base stations sold your company.
The only way to even start considering any of the current telecom vendors (including Huawei, NSN, etc) as not malicious is to have them offer their code under a libre license that bars tivoization, otherwise there is no guarantee that you can load the firmware they gave you the source to onto the LTE base stations sold your company.