3 possible reasons why a SMS message would fail to reach users mobile?

Several factors can cause an SMS message to fail in reaching a user's mobile phone. The three possible reasons include:

B. SMS sent to landline number: If an SMS is directed to a landline number, it will fail because landlines do not receive text messages.

D. Out of cellular network coverage: If the recipient's mobile device is out of the range of a cellular network, it won't receive SMS messages until it returns to a covered area.

E. Low battery: If a mobile device's battery is too low or the phone is turned off due to low power, it may not receive SMS messages until it is recharged and turned back on.