Answer:
It depends. You should still have Alltel until you get a letter in the mail saying you have Verizon. After you get the letter, you have to get Verizon phones and plans (you can keep all current phones and plans once u change to Verizon) Before you get the letter, you can still change to an Alltel phone or plan but Verizon customers cannot get Alltel stuff. Since it is already March, and if you did not get a letter saying you're gonna transition to Verizon than the merger is not gonna affect you
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If u want to stay alltel once u get the letter, u can call customer service and request to stay on same plan as alltel customer. the letter does not state this, but my mom did it. she's still on prepaid alltel plan. prepaid alltel had Unlimited text, whereas, prepaid verion does not.