'Mobile Internet' refers to access to the Internet from a mobile device, such as a smartphone or laptop via integrated abilities or via an independent device (such as a USB modem or PCMCIA card). Today USB modems are HSPA (3.5G) modems. Many users "tether" their smartphones to their laptop or personal computer with the wireless device providing access to the Internet via 3G, GPRS or CSD. According to BuzzCity, there's a 30 percent increase of mobile internet in a quarter from Q1 to Q2 2011. The four countries that have advertising impression in total more than 1 billion in one quarter were India, Indonesia, Vietnam and United States