Hi Rose, I'm with vodafone as well but I get good service, If you're in a contract then vodafone should've made sure you had service in your area... The link below is the Telecommunications Industry Ombudsman, Contact then but if you're out of contract and your phone is locked to vodafone just ring vodafone to unlock AND then shop around, I hope this helped...........CHEERS..
Telecommunications Industry Ombudsman TIO