Pros
Compensation is competitive but you will work very hard for it. Culture is excellent and exhibited and practiced from the top down. Benefits are excellent and cost reasonable. 401k match and profit sharing. Lots of training and professional development opportunities. Can advance if you're willing to relocate.
Cons
Company is trying to transform into what it wants to be beyond a wireless carrier (cloud?, security?, telematics?, wholesaler?, etc) and is struggling with a vision, resources, and org structure to make it a reality. Several re-organizations over last few years so job security has frequently been a question. Often delayed response to competitors caused by management's concern that acting would result in not meeting Wall Street expectations. Not the "happiest" place to work because no result is ever good enough and successes aren't celebrated because the focus is always on the next weekly/monthly/quarterly goal.