Why can’t I send picture messages from my iPhone to non iPhone devices
It sounds like your iPhone may be defaulting to sending messages via iMessage.
Any Android devices will reject this.
Please try the following:
I hope this helps
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Beware though, if you turn iMessage off, all picture messages you send to iPhones as well as Android will be sent as a MMS - at 50p each 😖
As for not being able to send them to Android (MMS), check you do not have your spending as £0 and that you have mobile data enabled when trying to send or receive a MMS.