When activating an LTE device on the Revol network, please make sure that you properly convert the IMEI into the decimal format of the ESN or MEID. You can use the ESN Converter in the Houdinisoft application (Open Houdini> Settings> ESN Converter) or a website like meidconverter.com. The decimal format you activate should start with 25669...
For example: IMEI is:
99000075XXXXXX convert this to decimal MEID and
the MEID you activate should be: 256691416XXXXXXXXX