We hear a lot of manufacturers telling us that Ice Cream Sandwich is coming, but HTC has gone the other way, confirming devices not getting the Android upgrade.HTC has just published a full upgrade schedule, which gives an approximate date for all future ICS upgrades. But of more interest perhaps is the confirmation of devices not getting the upgrade at all.HTC says that 'in general, devices with 512MB ROM or less will not be upgraded to Android 4.0', adding that the 'HTC ChaCha, HTC Salsa, HTC Wildfire S, HTC Explorer, and others' will remain at their current version of Android.On top of that, HTC has also confirmed that a number of its tablets will remain on Honeycomb too, including the HTC Flyer. It's not all bad news though, with HTC confirming that 'upgrades are not the same thing as ongoing support. Devices not being upgraded to Android 4.0 will still get software improvements, security fixes, and technical support as needed.'If your phone isn't one of the above, check that update schedule, with a date for more or less all the other HTC phones now available.