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Bellview Mobile is offering current customers a free upgrade to its Plus data plan for the first three months. To qualify, customers must have been on their current plan for at least six months and must opt in through the Bellview app before the end of this month. After the three-month trial, the Plus plan will continue automatically at its regular monthly price unless the customer switches back to their original plan before the trial ends. Customers can check their eligibility by logging into the app and looking for the 'Upgrade Offer' banner on the home screen.