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Welcome to Just Answer sorry to hear your having issues with your iPhone.
To confirm your using a new SIM as your changing providers to Asda and wishing to port the number ending 1999 over to your new Asda SIM?
Right, so currently when you call the new number (ending 1550) the phone rings but when you call the old number (ending 1999) it goes to voicemail?
Not a problem this isn't an immediate service so cant take time for a response anyway.
It suggests the number hasn't been correctly ported, so need to contact the service team between 8am and 8pm on 0808(###) ###-####/p>
Do let me know if you need any further assistance or anything clarified.
Have a good evening.