S4 watch. You mentioned you were unable to resubscribe NumberShare on S4. Do you need unpair and pair S4 with iPhone again or simply go to mobile data setup to subscribe.
I have problem subscribe NumberShare for my S4 watch. But I have never subscribed NumberShare before (so the issue may not be the same as yours). I have called 1688 many times. The response from CSO are varies, one asked me to unpair and pair again, one asked me to wait for 24 hrs, one asked me to switch off Bluetooth on iPhone and switched off wifi on watch before subscribe. None of above works. I have unpair and pair a few times and each time have to setup the watch again, customized watch faces, added cards for Apple Pay etc. Very frustrating and yet, still cannot subscribe NumberShare.