help how to change voice mail number calling

[cellulartalk]

hi im using verizon cdma iphone 4s on gsm network with gevey multi network sim,everything works except voice mail i can recive notification but when i press voice mail button i have busy tone thats because under settings and phone somehow i got installed vodaphone vf nl services??? i dont know how...

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Courtesy of WestNet Wireless
www.westnet.ca