Okay as per new law all Saudi mobile networks need to update their mobile phone SIM cards and link them to a VISA/Iqama (Residence) or ID (Citizen) number.
If you on Mobily and would like to register your SIM check out the attached guide where you can DIY. All you need is:
– ID Type,
– ID Number
– SIM Card Number
– PUK 2
– and a scanned copy of your ID.
Review the comprehensive guide here.