I’ve missed quite a lot of calls recently because my phone hasn’t rung or anything - and my sister tells me that when she tried calling me, my number isn’t recognised! I tested this from my landline, first trying my number with ‘0’ at the front. It told me the number isn’t recognised. So then I tried it with ‘44’ at the beginning instead, and it went straight to ID voice mail.
Can you shed any light on why this might be happening and how I fix it, please?