If Catherine could see us now.

T-Mobile received the highest index score (105) in a JD Power and Associates study on wireless-customer care performance, followed by Verizon Wireless (101), Alltel, (99) and AT&T (99), writes MarketingCharts.

Of all wireless customers, 46 percent have contacted the customer-care service center for assistance within the past year, the study found. Of these contacts:

• 42 percent concerned a billing-related service inquiry.
• 57 percent were attributed to inaccurate charges.

Among customers who contact their carrier:

• 73 percent do so by telephone.
• 23 percent do so through their carrier's retail store.
• 4 percent use the internet (email or company website).

MarketingCharts has additional findings from the study.