AT&T has been testing the viability of loyalty rewards through a limited AT&T Plus trial over the past year. Unfortunately, time's up: as you can see in the letter above, the carrier is shutting down the Plus experiment on March 31st, with discounts and fee waivers ending for existing members on May 31st. We wouldn't expect a follow-up in the near future when AT&T isn't moving past the trial level "at this time," according to a spokesperson we reached. Most of us won't be affected when the Plus test has been limited to a handful of areas, but perks are perks -- it's sad to see them go aw
