Verizon Wireless is in the midst of a one-day sale that offers great value to prospective subscribers and current customers looking to upgrade. Dubbed “Social Friday,” the nation’s top carrier has knocked 30% off all devices purchased online between 12:01 a.m. and 11:59 p.m. on Friday, March 11th. Of course Verizon uses the term “all devices” loosely, and the most popular high-end devices in the carrier’s portfolio — DROID-branded phones, the iPhone and all tablets such as the iPad 2 — are excluded from the sale. There are plenty of other great devices in the carrier’s lineup, however, and they’re all on sale for almost one-third off until the end of the day.