1) create account with visible.com
2) Fill out porting info. Port number and account porting PIN.
3) Visible then ship your sim card in priority.
4) Once porting is approved by your current service provider. Visible will send you email.
5) Put your sim in your mobile and follow Visible activation process.
P.S: Please mark my answer as solution if it helped you. Thanks.
What upstate-SC said is correct, do you have a more specific question about the SIM card ordering process? That may help us give a more tailored response to your issue, and help others out in the future.