MyMobile should be able to be used in any network, but you have to use the IP connection. When used within internet, your firewall settings etc. must be adjusted to allow the MyMobiler TCP/UDP ports for incoming connections. Possibly the connection ports are blocked by some ISP (if used in GSM/CDMA networks).
There are alreday some management solutions that provide remote access to any mobile device with an agent installed: I can list some here (without being a complete list):
AirWatch
SOTI Mobile
Wavelink Avalanche
(Intermec) SmartSystems
...
Note: Using remote view over GSM may be slow and unreliable.
There are vendor specific MDM and independent MDM solutions.