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You need to tell us a bit more. Does it never have service or does it just frequently lose servive?
If your phone doesn't have service ever -check and make sure the sim card is in place and secure, make sure your phonebill is not overdue, or call your service provider and ask them what is going on, it could be a cellphone tower that went down.
If you get service occasionally but keep losing the signal it could be your location - certain buildings (especially with metal roofs) block cellphone signals. It could also just be the part of town your in - they may not have a cellphone tower close enough to where your at to get a strong signal.