SingTel, one of the main telecommunication operators in Singapore, announced on Wednesday that it has begun doubling the speed of its 4G network, from the original 150 Mbps to 300 Mbps.

It said the first live site at Singapore Expo is now ready for service, representing the first live 4G service which offers data speeds of up to 300 Mbps. By the end of the year, more than half of the island will be covered, including areas such as the CBD, Changi Airport and popular shopping malls.

Nationwide upgrade is expected to be completed by the end of next year, the company added.

SingTel\'s 4G download speeds are now up to 150 Mbps, with typical speeds of 7.5 Mbps to 50 Mbps.

SingTel also announced that its mobile users will be able to roam on a 4G network in China for the first time. It will cost the users 20 Singapore dollars ($16) per day. SingTel is said to offer the unlimited 4G data usage via its partner China Mobile, one of the country\'s largest mobile operators.

Johan Buse, SingTel\'s vice president of consumer marketing, said: "As the second most popular destination for Singapore travelers, China is an important addition to our global 4G roaming network."