India takes the biggest pie as all its call centers have English speaking personnel.
Indian Call Centers include:
Genpact: This Indian BPO company is based at Gurgaon and has a global presence with many centers in China, Philippines, Romania, Hungary, Poland, Mexico, and USA.
i-Flex solutions: It is one of the world’s leading providers of IT solutions, with special focus on the financial services industry like banking. It has its registered office in Mumbai.
Satyam Computer Services Ltd: It is a leading name in IT industry that offers an impressive array of specialized, end to end IT solutions to its customers. It has business operations that span across 55 different countries through its network managed by over 40,000 skilled professionals. Its clientele include hundreds of global companies and Fortune 500 corporations.
ITC Infotech: Is one of the most enterprising IT companies worth US $ 6 billion. It has left its indelible imprints in around 44 countries all over the world, and is touted as one of the fastest growing IT services companies to have bagged reviews from experts all over the world.
The Philippines has the distinct advantage of being the third largest English speaking country in the world coupled with an impressive literacy rate, making it a hot choice for call center services. There are hundreds of call centers in Philippines, mostly centered in Manila and also in the business hubs of Ortigas Center in Pasig City, Eastwood City Cyberpark in Quezon City, and Fort Bonifacio in Taguig City.
Philippines Call Centers include:
Ambergris Solutions,
AOL Member Services Philippines Inc.
APAC Customer Services, Inc.
Converges
Toltec
Clientlogic
pelt
China boasting of a huge manpower reserve is slowly catching up with the rest. There are some call centers that cater to English speaking users, such as
China Call Centers include:
Guangzhou 3G Information Technology Co. Ltd: It was taken over by PacificNet Inc., a leading Chinese telecom services provider.
Germany also has some English speaking call centers:

Kaiserin-Augusta-Allee in Berlin
West Africa
West Africa is creating ripples in the call center industry by its first ever call centre in Ghana. It is located in the capital city of Accra and is founded by Karim Morsli on an on an experimental basis with only four staff members.
Supra Telecom: It is a Florida based company that has set up a call center facility at Accra, the capital city of Ghana.