I have a FS libre reader from the UK (for my daughter) and now I have sensors form Germany because I am away from the UK. The last UK sensor will expire in about three days and I have to start a new sensor from the ones I got from Germany. I heard that if the sensor and the reader are from different countries they will not communicate with each other( language barrier). So do think this going to be the case and is there away around it. I have 8 sensors from Germany and I do not want to loss them. I tried to got a help from freestylelibre,co.uk but it seems they are helpless.