LIVERMORE, Calif., March 19, 2013 /PRNewswire/ -- Comcast, the nation's largest Internet service provider, today announced it is increasing the speeds of two of its most popular XFINITY Internet speed plans, Blast! and Extreme 50, in California* for no additional cost. Customers will enjoy more than twice as fast Internet speeds on multiple devices, allowing them to surf, chat, stream HD movies and TV shows, or game online with double the speed. Also for no additional cost, Comcast is increasing the speed of its widely used Performance plan by more than 60 percent. "As customer demands and technology evolve, we continue to increase our broadband speeds to deliver the best, fastest and most reliable Internet experience possible for our customers," said Hank Fore, Regional Senior Vice President for Comcast California. "Whether chatting, surfing, streaming, gaming, skyping or downloading, families will get the superfast, high-performing Internet service they need, with no extra charge." Specifically, the Blast! plan is increasing download speeds from up to 25 Mbps to speeds up to 50 Mbps and upload speeds from up to 4 Mbps to up to 10 Mbps, while Extreme 50 customers will receive download speeds up to 105 Mbps (formerly 50 Mbps) and upload speeds up to 20 Mbps (formerly 15 Mbps). The Performance plan is increasing to speeds up to (20 or 25) Mbps from 15 Mbps downstream and to (4 or 5) Mbps from 2 Mbps upstream.To activate the new speeds, customers just need to re-start their cable modems. *Note: A few select areas in Comcast's California footprint will not receive the new Internet speeds: Santa Cruz/ Scotts Valley Area (will receive the new speeds this Summer); as well as Arbuckle, Maxwell, Williams, Auburn Lake Trails, Isleton, Tower Park and Rio Vista. Also, Blast! customers who have a 1.1 or 2.0 cable modem will need to exchange their modem for a 3.0 device to achieve the new speeds. This exchange can be done by calling 1-800-COMCAST and having a new self-install device sent to the customer's home. For the third year in a row, the Federal Communications Commission has shown that Comcast delivers speeds to customers that are even faster than the advertised speeds. Comcast is not only delivering the nation's fastest Internet, but it is also providing the fastest in-home WiFi with its latest Xfinity Wireless Gateway, an all-in-one device that gives customers reliably fast speeds with the most coverage in their home so everyone can get online and do more on their devices all at the same time.