Possible to change USB Data modems (Huawei)?

Hey guys,
I am using a Huawei EC150 USB modem with my Reliance Netconnect +. The model is not currently supported by my 3g router, so I was planning to shift to Huawei EC1260 which is shown in the supported list.
I wanted to know whether I would be able to change the USB data modem, without changing the plan and tariff, and if yes, do I have to pay for the data modem entirely or can I get it exchanged or something, citing that there is some problem with the current piece/incompatibility..

Thanks.
 
I just did that. But what they are saying is that as long as the 3g modem is working fine, they can't change it.

Is it possible to flash my EC150 firmware with that of EC1260/1262 (which is in the supported lists of 3g modems)?
 
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