There are thousands of 3G and 4G usb modems in the mobile internet market, which are manufactured by big brands like Huawei, ZTE, Option, Sierra Wireless, etc.  But most of users get the usb modems with SIM Card contract, few people know how to choose usb sticks or wireless 3g routers independently for your sim card, if you don't want to be restricted by the contract.

For example, if you want to buy an usb modem to use your phone sim card, how to choose the right one to make sure it compatible with your phone card.

 

First, Choose the unlocked modem or router

Why unlock the modem, what are the benifits?

As we know most mobile broadband service providers are providing free usb modem with sim card plan, those modem or routers are locked which only works with this operator's sim card, so we cannot able to use any other sim with that device.
So, in order to get freedom to use any gsm, umts or lte sim card on it we need to choose an unlocked usb modem.
The unlocked usb modems are usually come from original factory or contract modems unlocked by detailer themselves.

By unlocking modem we remove barrier from the carrier and got freedom to use any sim.

What Are The Benefits ?

By unlocking modem you are able to use any mobile broadband operator sim card in that unlocked modems.

 

Second, Check the parameter of usb modem make sure the gsm, umts or lte bands are match with your operator

All operators are operating their own 2G/3G/4G bands, so if the usb modem support your operator wirless bands, it works with your SIM card.

The following is the common used 3G UMTS bands by Vodafone in Europe.

 

Operator

Country

Launch date

Bands/Frequency

Vodafone

Portugal

May 2004

2100

Vodafone

Netherlands

June 2004

2100

Vodafone

Czech Republic

March 2010

2100

Vodafone

Germany

May 2004

2100

Vodafone

Hungary

June 2006

2100

Vodafone

Greece

August 2004

2100

Vodafone

Ireland

November 2004

2100

Vodafone

United Kingdom

November 2004

900/2100

Vodafone

Romania

April 2005

900/2100

Vodafone

Spain

May 2004

2100

Vodafone

Australia

October 2005

850/900/2100

Vodafone

New Zealand

August 2005

900/2100

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

You can also find more operator’s UMTS and LTE bands from Wikipedia
List of UMTS networks
List of LTE networks
National Operators

 

Ok, These are the two points you need to pay attention when choose a USB modem or 3g router.
Just enjoy your mobile Internet.