No there is no price difference; we offer you the best network when you pay for your internet data pass. You’ll be on 4G if you fulfill all of the below:
You are using a LTE enabled device
You have a valid Mobile Internet Pass (whether 100MB or 2GB, as long as you have high speed quota)
You have an LTE-enabled SIM (Any sim card above 64K supports 4G. Just need to check whether your SIM is 32k, 64k or 128k from the front of your SIM card)
You have turned on LTE on your mobile device setting
You are within LTE coverage area
So wait no more and switch to Maxis 4G LTE!