How to connect to Internet Using Blackberry

In the blackberry there are many standard connection methods.

1. BES/MDS
2. Direct TCP
3. WiFi

But in these methods some times will not work on all the careers so their is a another undocumented method that you  can use.

package com.rdmcorp.itms.sdm.DataService;

import net.rim.device.api.servicebook.ServiceBook;
import net.rim.device.api.servicebook.ServiceRecord;
import net.rim.device.api.system.CoverageInfo;
import net.rim.device.api.system.DeviceInfo;
import net.rim.device.api.system.WLANInfo;

public class ConnectionCreator {
 
    public static String getConnectionString() throws ServerException 
    {
        String connectionString = null;                
                        
        // Simulator behavior is controlled by the USE_MDS_IN_SIMULATOR variable.
        if(DeviceInfo.isSimulator())
        {
            connectionString = ";deviceside=true";
        }                                        
                
        // Wifi is the preferred transmission method
        else if(WLANInfo.getWLANState() == WLANInfo.WLAN_STATE_CONNECTED)
        {
            //logMessage("Device is connected via Wifi.");
            connectionString = ";interface=wifi";
        }
                        
        // Is the carrier network the only way to connect?
        else if((CoverageInfo.getCoverageStatus() & CoverageInfo.COVERAGE_DIRECT) == CoverageInfo.COVERAGE_DIRECT)
        {
                       
            String carrierUid = getCarrierBIBSUid();
            if(carrierUid == null) 
            {
                // Has carrier coverage, but not BIBS.  So use the carrier's TCP network
                 connectionString = ";deviceside=true";
            }
            else 
            {
                // otherwise, use the Uid to construct a valid carrier BIBS request
                connectionString = ";deviceside=false;connectionUID="+carrierUid + ";ConnectionType=mds-public";
            }
        }                
        
        // Check for an MDS connection instead (BlackBerry Enterprise Server)
        else if((CoverageInfo.getCoverageStatus() & CoverageInfo.COVERAGE_MDS) == CoverageInfo.COVERAGE_MDS)
        {
            connectionString = ";deviceside=false";
        }
        
        // If there is no connection available abort to avoid bugging the user unnecssarily.
        else if(CoverageInfo.getCoverageStatus() == CoverageInfo.COVERAGE_NONE)
        {
            ServerException exception = new ServerException(000,"No connection found");
            
            throw exception;
        }
        
        // In theory, all bases are covered so this shouldn't be reachable.
        else
        {
            connectionString = ";deviceside=true";
        }        
        
        return connectionString;
    }
    
    /**
     * Looks through the phone's service book for a carrier provided BIBS network
     * @return The uid used to connect to that network.
     */
    private static String getCarrierBIBSUid()
    {
        ServiceRecord[] records = ServiceBook.getSB().getRecords();
        int currentRecord;
        
        for(currentRecord = 0; currentRecord < records.length; currentRecord++)
        {
            if(records[currentRecord].getCid().toLowerCase().equals("ippp"))
            {
                if(records[currentRecord].getName().toLowerCase().indexOf("bibs") >= 0)
                {
                    return records[currentRecord].getUid();
                }
            }
        }
        
        return null;
    }
}