The Go Mobile service on the DeviceFidelity microSDs is the same implementation that the Isis telcos in the U.S. plan to launch for their two-city trial in Salt Lake City and Austin, Texas. DeviceFidelity changed suppliers of the embedded secure element for the U.S. Bank and also the forthcoming Isis launch to a chip from STMicroelectronics, which has more memory for applications. The chip carries a total of 1.2 megabytes of flash memory, about half available for services, and Isis requested the extra memory. DeviceFidelity had been using both an NFC chip and secure element from NXP. U.S. Bank launched its first trial of contactless microSD cards in late 2010 and extended it to a number of cities. It hasn’t released results of the trials publicly. But in its announcement of the Go Mobile service, the bank’s chief innovation officer, Dominic Venturo, said the bank has “incorporated all of the feedback we have received from prior pilots and our customer research into this latest offering.” A number of other banks have trialed DeviceFidelity's technology, with mixed results. The banks used earlier versions of the iPhone case, as well as contactless microSDs that could be inserted into non-NFC-enabled BlackBerry and Android phones.