Hi Stanny,May i know what is the speed supported by Centrin via XL? What settings do you need to configure to use their service ?FYI, The max speed supported by this unit is 384Kbps. If it’s a stock unit that comes with a Merlin U630 datacard. If yo218#u&7;re planning for a higher speed, you can replace that datacard with another that support HSDPA. I’ve not done that personally though.