I’ll leave it up for others to judge if it has been a smart move of Sony-Ericsson to use Microsoft Mobile along UIQ as an OS for their high end phones. So I have a different pitch for this story: When browsing the specs of their new Windows OS Experia X1 phone I noticed that it will come in two hardware versions: One supporting HSPA in the 850/1700/1900/2100 MHz bands and another one in the 900/1700/1900/2100 bands. The first variant is probably targeted at the US and Australian market since they have networks in the 850 and 1900 MHz bands and that one odd HSPA network of T-Mobile in 1700 MHz. The 2100 Mhz is for roaming. The second variant seems to address the European market where we might see UMTS migrating to the 900 Mhz band soon beyond the first network in Finland using this frequency. So while I am happy to see quad band HSPA support coming soon I have the feeling that the story does not end here.