Upgrade is definitely not mandatory. If the UM +423 works well for you, I'd stay with it.
Quote:
Originally Posted by prion
I was wondering if the upgrade is mandatory.....What would happen if someone did not upgrade?
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Phones: Xiaomi Mi Mix 2, Samsung Galaxy A50, ASUS zenfone 3,
Sim cards: AT&T (Contract), 3 UK, Piranha Mobile