Did you successfully activate the SIM?
- https://community.48.ie/t5/The-Knowledge-Base/Getting-Started-How-to-Activate-your-48-SIM/ta-p/53099
Is the watch unlocked for use on any network?
Does anything work - e.g. connection to the 48 network - i.e. signal bars?
Other features?
What model of Imoo watch is it?
Have you consulted and followed the instructions for setting this watch up with a SIM?
What exactly have you tried?
E.g. this - note that 48 is an MVNO (Mobile Virtual Network Operator):
If you need to contact 48 support about this then see the links in my signature below.
