Mixing Android and Apple devices can be fraught with complications. Nothing is necessarily broken, but you need to understand how your messages are bing sent - and over which Messaging service. The native Messages App is clever enough to send messages over the most appropriate messaging service - but if you mix Apple and Android platforms, you can see some potentially unexpected results.
First, understand the different types of messages in the Apple Messages App:
- Blue Bubbles = Apple iMessage
- Green Bubbles = SMS (Text) or MMS (Picture) messaging over Cellular messaging services
Do you have an iPhone - or just an iPad?
An iPad, whether a Cellular model or not, is not capable of directly accessing Cellular Voice or SMS/MMS Messaging features. An iPad with either WiFi or Cellular connectivity alone can only access IP-data services.
However, If paired with an iPhone, the capabilities of iPad significantly broaden to include access to Cellular Voice and Messaging services of the associated iPhone - relayed to the iPad over WiFi using Apple’s continuity features.
More information about Continuity and the relevant Cellular services can be found here:
Continuity
Use Continuity to connect your Mac, iPhone, iPad, iPod touch and Apple Watch – Apple Support
SMS/MMS Messaging
How to forward SMS/MMS text messages from your iPhone to your iPad, iPod touch or Mac - Apple Support
WiFi Calling
Make a call with Wi-Fi Calling – Apple Support
If you have an iPhone - and both iPad and iPhone are signed-in to iCloud with the same AppleID, to send SMS/MMS messages from your iPad you must explicitly enable Text Message Forwarding for your [new] iPad on your iPhone...
On your iPhone:
Settings > Messages > Text Message Forwarding - set to ON - and explicitly enable your iPad from the list of devices.
Also ensure that Messages in iCloud is enabled on both your iPhone and iPad:
Settings > [Your Name / AppleID] > Messages - set to ON
If you are instead attempting to use an Android phone with an iPad - you need to understand that Android cannot send or receive messages using the Apple iMessage service - and can only use SMS Text. Similarly, you should now understand that whilst iPad can send and receive messages using the Apple iMessage service, without a linked iPhone, iPad cannot send or receive SMS text messages unless it is paired with an iPhone.
