No sim showing/lost service/phone number unknown- all sometimes.

[Master-of-none]

Samsung A12 My sim is in and working. If I use the Internet either vai WiFi or 4g my connection for calls and text will often stop working. On sim settings it shows no sim. When a sim does show it is Sky and number or Sky unknown number. When the latter happens a red dot appears in the the top right and an R on the signal bar. I ordered a replacement sky sim but I'm unsure/don't know how to transfer to it without losing something. Prior grovelling gratefulness to whomever for your abundent and helpful utterings oozes from my very being. 😉

[caesarome]

When you activate the replacement sim it will cancel the other one so it is worth trying this to see if it fixes it.