All the international sims (UM, yackie, freeglobalsim) and some local sims I have had come with call waiting deactivated by default. I usually had to activate it through the phone's menu. Have you tried that? When I try the call waiting menu on my V551, it says request not successful.
Quote:
Originally Posted by Keighleyboy
The only feature UM+ won't do is Call Waiting
UM +423 still allows Call Waiting
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Phones: Xiaomi Mi Mix 2, Samsung Galaxy A50, ASUS zenfone 3,
Sim cards: AT&T (Contract), 3 UK, Piranha Mobile