First off, check that you have subscribed to a suitable service. ‘Limited Service’ can suggest that you do not have both GlobalStar and GSM services. Secondly, try setting the SAT550 to GlobalStar mode as normal, and keep in on in search mode for several minutes. This kind of global search is normally done with brand-new phones, as the phones do not know which gateway they are in. After a first successful registration (for example in the UK to ‘GSTAR-EU1’), if the user subsequently moves to under another gateway and switches the phone on, the phone will repeat the global search. So switching the phone on and off to enable a re-search (taking care to ensure that there are no obstacles in line of site with the sky), should resolve the condition.