开通 is used for transport routes (开通航线 = open a flight route), digital services (开通会员 = activate membership), and communication (开通国际漫游 = activate international roaming).
mistakes
The same two characters are a different word when the second syllable goes neutral. 开通 describes a person as open-minded and not stuck in old ways, as in 思想开通. Every route and service sense on this page keeps the full tone, 开通.
