If I'm on the grandfathered $30 5GB/100min plan, and I'm thinking about getting a new phone. Can I switch devices, without losing the plan? Do I need to use the same SIM card, or can I keep the plan with a new SIM?
Your plan is tied to the sim card not the phone.
Even if you need to change the sim card you will keep your plan.
I have that plan and changed phones recently with no problems - I did use the old sim card though.
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