I do technical escalations for a mobile phone company.
I test phones, offer advice to our tech customer service advisors, raise investigations to our network engineers. Plus loads more.
I develop software for systems that use either synthetic test instruments or transmit/receive modules. These systems are used to test payloads of commercial satellites.
I used to write software that analyze telecom network faults to pinpoint the problem's root cause, in use at Verizon.