Analysts at J.P. Morgan cut their ratings on Leap Wireless International Inc. (LEAP) and MetroPCS Communications Inc. (PCS) to neutral from overweight Thursday.

"We have become increasingly concerned with wireless fundamentals as the industry faces secular challenges, with high penetration and heavy competition causing downward movement on price and increased acquisition costs," they wrote in a note to clients.

"We believe Leap and Metro have been forced to operate more and more defensively, and we expect to see additional ARPU [average revenue per user] erosion over time while long-term margin guidance could be challenging."

Shares of Leap ended Wednesday at $19.55 and those of MetroPCS closed at $9.36.

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