@Lola, after thinking about this a bit there is no reason you need to go out and buy an expensive smartphone or sign up for cell service you don't want or need. All you really need to do is buy a cheap generic Android tablet computer on eBay or from a Chinese online vendor. This would provide you with a simple way to program your Mobius and you would end up with a fully functional WiFi enabled small tablet computer as part of the bargain. It won't have a hi-rez screen like an iPad or Samsung but it should do the job.
There are dozens and dozens of these things on the market and this is but one example:
View attachment 25388
Teclast P80H 8GB MT8163 Quad Core 1.3GHz 8 Inch Android 5.1 Tablet
CPU MT8163 Quad Core 1.3GHz
GPU Mali T720
System Android 5.1
RAM 1 GB
Capacity 8 GB
Screen 8 Inch IPS Capacitive 5-point Multi-touch Screen
Resolution 1280x 800
Extend Card Support TF card
Camera Front Camera:0.3 MP; Rear Camera: 2.0 MP
WIFI Support
Bluetooth BT 4.0
Gravity
Sensor Support
GPS Support
OTG Support
HDMI Support
Microphone Built in
Speaker Built in
I/O Port 1 x Micro2.0 Port
1 x 3.5mm Earphone Port
1 x TF Card
1 x HDMI Port
Battery 3400mAh
Weight 331.5g
Size 210mm x121mm x 9.9mm
Package
Included 1 x Tablet PC
1 x USB Cable
1 x Charger
1 x Adapter (the adapter depend on the country of the buyer.)