iMessage activation error

Hi all,

i have got an issue since moving to my new iphone 15 max regarding to active the iMessage. I have gone through all the steps on the internet also talked to apple support and solution provided did not work. One option is left to do is that to fully reset my phone and due to loss of data such as whatsapp is nightmare for me.

p.s., i have tested my sim card on another same iphone same wifi got activated in seconds i have put other sim card in my iphone got activated. So it seems it has an issue with the sim imigrated from my old iphone. There should be glitch i guess related to mass messages moved onto new phone. Bytheway i removed all the messages and did not work.