A roaming SIM can reduce roaming charges even though it roams on the very same networks as "normal" sim cards use such as Vodafone & T Mobile.
Roaming charges manifest themselves in the form of higher outgoing call costs and incoming call charges. The roaming charges can add significant costs to mobile phone bills which can run in to hundreds of pounds or dollars. Mobile phone users should take care when travelling and using their mobile for calls, SMS (Texting) and Data as some calls can cost as much as £3 (about $4.50) per minute.
Using a roaming SIM card can reduce call costs significantly by using alternative routes or specialist providers such as GeoSIM.
There are a number of methods to reduce roaming charges or avoid roaming charges completely, some are quite "drastic" and impractical such as not using a mobile when travelling . For many this is impractical and unreasonable, espeically for business users.
Some travellers buy a local SIM card of the country they are visiting instead of using thier home networks SIM. This means that roaming charges would not be applicable as the SIM is "local" and therefore not roaming. The problem with this method is that friends, family and contacts back home will have to call an international mobile number. Also, if the user happenes to cross the border to another country they would incur roaming charges. Or, in some cases the SIM card may not work at all as often, pay as you go SIMs do not have roaming activated or allowed. People that travel regularly to different countries would require a a different SIM card for each country they visit. This causes a "SIM management nightmare" becuase contacts back home would have to call a different number each time the traveller arrived in a different country. Carrying multiple SIM cards is inconvenient and impractical.
One of the most popular and practical solutions is to use a roaming SIM card or Global SIM card. A roaming SIM card reduces roaming charges significantly and often has free incoming calls. Typically a roaming SIM card will have one or more numbers associated with it. This means that contacts will only need to call one number no matter which country the traveller is in. This avoids the issues of carrying multiple local SIM cards and different contact numbers.
Roaming SIM cards typically have advanced features such as voice mail to email, global call forwarding, realtime online billing/call logs and auto top up facilites.
