Sometimes I get a green bubble when sending a text via Messages to a person with an Apple device.
An Apple Support article indicates that “An unexpected green message bubble” can occur when “iMessage is temporarily unavailable on your device or on your recipient’s device.”
Can anyone comment what would cause iMessage to be “temporarily unavailable”:
- Does this unavailability refer Apple’s service or the users’ device connectivity? (Presumably each user’s connection can be either WiFi, cellular, or wired.)
- Regarding user connectivity, does this refer to TCP/IP alone or is an SMS/MMS connection sufficient?
- Regarding wireless—either WiFi or cellular —connectivity, is availability affected by whether either the sender or intended recipient has cellular data turned on or off? (Isn’t SMS/MMS transmitted on its own channel—separate from voice and data—so isn’t signal strength—the number of cellular service bars—the sole determinant for connectivity?)
- The whole issue of iMessage being “temporarily unavailable” really baffles me. Isn’t it a store-and-forward protocol like SMTP? If not, then what causes a blue bubble with “message not delivered” below it?
Thank you for your input.