Here are the top five modems supporting 3G network and have the same or higher capability than the Micromax modem which you want to change.
1. Huawei E5776:
Huawei E5776 currently has become one of the most promising 3G and 4G Wi-Fi hotspot. It has support for most of the 3G and 4G mobile networks offering the maximum speed of 43.2 Mbps speed on 3G network and 150 Mbps on 4G LTE network.
2. Beetel 3G Max:
BeetelWi -Fi 3G modem has comes with the same specs, data speed and running time as that of Micromax 400R. But it has the capability to handle a 32GB MicroSD card offering faster upload speed of 5.76 Mbps in comparison to the Micromax MMX 400R modem.
3. Lava Mi-Fi Router W150:
Lava mobile Wi-Fi 3G router is able to connect to 3G as well as CDMA data cards. It provides an option to convert a Wired connection to Wi-Fi. All you need to do is to connect the RJ45 cable which will automatically start acting as a Wi-Fi Router.
4. TP-Link TL-MR3020 Portable 3G Wi-Fi Router:
This W-Fi 3G data card is compatible with 3G/CDMA and RJ45 connectivity. It does not come with any SIM card slot. So one have to plug into it an external 3G/EVDO modem to activate the internet service. The size of this modem is just like a Credit card but the device is renowned for reliability and highly functional.
5. Huawei E355 Wi-Fi data Modem:
The Huawei E355 Wi-Fi 3G modem has its support up to 21.6 Mbps download speed and a 5.7 Mbps upload speed. It is equipped it with a Type3i data technology to enhance its data speed. It has got options to connect it with multiple devices like Smartphones, tablets, Smart TV, gaming console, music pods and so on. It's MicroSD card slot supports 32GB memory cards.