Phone Field Renderer

Try replacing this line:

field.model.updateRow(field.row,'PersonMobilePhone',stringValue,{initiatorId: field._GUID}); 

with this:

field.model.updateRow(field.row,'PersonMobilePhone',<b>phonevalue</b>,{initiatorId: field._GUID}); 

Also, I’m assuming that the API name of “PersonMobilePhone” is correct and it’s not “Person_Mobile_Phone__c” or something. Out of curiosity what type of field is PersonPhoneMobile?