Hi Changed sensor this morning. As normal I activated it with the reader, not sure why, just what the Abbott rep recommended when I trialled it earlier this year. Anyway normal message, wait 60 minutes so I took the dog out. Have tried fixing this one 2 days before as discussed in other threads. When I got back, I thought I'll do a prick test then wait 10 minutes. This took me to 80 or so minutes after activation. I got an error saying you have to match the phone within the 60 minutes. I have used about 10 sensors before and never had this. Must have just caught 59 minutes or something. Anyway that's warning #1 for those like me who don't read the instructions. I thought I'd ring Abbott to see if there was a way to fix it, but apparently not. I couldn't face using the reader for two weeks, so I bit the bullet and downloaded Diabetes:M & Libre Sensor. It works fine, and not only that it's spot on with the prick test in initial tests. No calibration! The App looks good too. Early days and loads of stuff to investigate. Will post more after subsequent tests.