Unable to get verification numbers via SMS.
cannot receive verification numbers on messages
several sites send but no reception. texts work
but sometimes fail to send
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Generally, those verification codes are sent using Short Code Text Messaging. These short code text messages are received from a 5 or 6 digit phone number. This capability/feature is provided and managed by your carrier. I recommend that you contact your carrier and tell them about not receiving verification codes which may be sent over short code messaging service. Their support team should be able to address this for you and find a resolution.
Axel F.