If I upgrade to a new phone, can I keep my grandfathered plan?

I received another promotion about buying a new phone and keeping my same plan. If I buy a new Moto g 4, can I till keep my $10.00 plan?

Moderator’s note: Title edited to provide context.

the email was about keeping you coverage **NOT **your plan all 3.0 need to have a 3.0 plan ($15 is what replaced the $10 plan)

1.0/2.0 had CDMA (Sprint Coverage) until recently 3.0 was GSM (T-Mobile) the email was letting you know that 3.0 now has a Sprint option (as determined by Republic computer system as which would be best using the coverage checker Coverage Check | Republic Wireless

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