These include Sierra Wireless, Novatel Wireless, and a number of wireless chipset vendors.

FORBES: Public Safety Broadband Could Pump $10 Billion Into Wireless Firms

At Verizon Wireless, the number of text messages sent by its retail customers dropped from an average of 2, 110 in the third quarter of 2010 to 2, 068 in the fourth quarter, then reached 2, 104 in the first quarter of this year.

WSJ: Cellphone Carriers Face Pressure Over Texting

Vodafone recently joined Verizon Communications as a major investor in Iusacell, Mexico's number two wireless operator.

BBC: Vodafone: No US float timetable