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AT&T is a US-based telecoms company, and the second largest provider of mobile services and the largest provider of fixed telephone services in the US.

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Amazon

Internet & Digital Media

PwC UK

Accounting & Accounting Services

PwC

Accounting & Accounting Services

Zenta

Outsourcing

Walmart

Retail - General

Verifone

Financial Services

Wells Fargo

Financial Services

Microsoft

Software - General

Wipro Digital

Banking

Google

Internet & Digital Media

Apple

Consumer Electronics

ADVANCED SUPPORT SERVICES LTD

Management Consulting

GE Energy Connections

Oil & Gas Exploration & Services

Verizon

Information Services

OMD UK

Sales, Marketing & Advertising

HSBC

Financial Services

General Motors

Automotive

CBRE

Real Estate - General

Gartner

Information Services

Shell

Oil & Gas Exploration & Services