Sales force Integration

ContactController

//Visual Force Page
<apex:page controller="ContactController" showheader="false" action="{!pageDetail}">
<apex:detail subject="{!contactId}" relatedList="false"/>
</apex:page>

//Apex Controller
public class ContactController {
  public string contactId { get; set; }
  public ContactController() {
  }

  public PageReference pageDetail() {
    String dialNumber;
    String name;
    String fromPhone = ApexPages.currentPage().getParameters().get('phoneNumber');
    if (fromPhone!=null) {

      fromPhone= fromPhone.length() <= 10 ? fromPhone : fromPhone.substring(fromPhone.length() - 10);
      // search Lead and Contact phone number fields
      List<List<SObject>> results = [FIND :fromPhone IN Phone FIELDS
          RETURNING Contact(Id,FirstName, LastName,Owner.Phone), Lead(Id,FirstName, LastName,Owner.Phone)
          LIMIT 1];
    
      // extract the owner phone if there’s a match
      if (!results[0].isEmpty()) {
        Contact r = (Contact)results[0][0];
        contactId=r.id;
        //return r.id;
        //return new PageReference('/'+r.id);
      } else if (!results[1].isEmpty()) {
        Lead r = (Lead)results[1][0];
        contactId=r.id;
        //return r.id;
        //return new PageReference('/'+r.id);
      }
      else {
        Lead r = new Lead(FirstName='Lead', LastName=fromPhone, Email='example@example.com', Company='test',Phone=fromPhone);
         try{
         insert r;
       }catch(Exception e){
         System.debug('System exception ' + e);
       }
       contactId=r.id;
       //return r.id;
        //return new PageReference('/'+l.id);
       }
    }
    return null;
    }
}