Not all of these procedings involve the same issue as the recent Apple-FBI court battle over the San Bernardino shooter's phone. In some cases, the companies have complied with the warrant (that is, the phone wasn't encrypted or anything), however it should be noted that the Feds leveraged the All Writs Act, a statute they claim is used only as a measure of last resort, in every single one of these cases. Not unlike how they've managed to exploit PATRIOT Act provisions in the War on Drugs.