This is a generic way to request networks that has different subId but belongs to the same carrier. For example, cellular networks with different SIM card, or carrier Wifi that provided by the operator. Test: atest NetworkCapabilitiesTest#testSubIds Test: m doc-comment-check-docs -j Test: atest CtsNetTestCases Bug: 175662146 Change-Id: Ifca766f5acc73c285948d6251ec31506d9bb0bcb