You can subscribe to a global roaming plan with a carrier like T-Mobile, but the initial cost will be about $50 per month but then your usage charges are extremely low: about $.20 per minute in 115 countries, and no data charges for low-speed access. If you will be using your phone for making and receiving calls, then a second phone may be your smart choice.

If you subscribe to a prepaid data package and are mainly concerned with high Internet and email access charges, then you may be better off paying the bulk data purchase plan, usually around $25/100 Mbytes for thirty days. If you rarely travel and do not expect to receive a lot of voice calls, then you may not need to bother with a second phone number.

Whether you decide to subscribe to a second carrier and carry another cell phone depends on a number of factors, driven by price, convenience, your travel, and use. On-the-fly call routing between handsets requires the ability to call-transfer remotely. Depending on what country I am, I may choose to use one of the two handsets, switch to a local SIM card, or to my KnowRoaming account, based on the best voice and data rates. The inherent problem with using two phones, or a dual-SIM phone, or switching to a prepaid SIM is that regardless of what I do, I usually need to transfer my primary phone number to my second number in order to be accessible. Different carriers can offer widely varying roaming prices so you can reduce drastically your communications charges by adopting a practice of least cost routing by switching handsets. and my T-Mobile number almost everywhere else in the world.

In my case I use my Verizon-assigned number primarily when I am in the U.S. Many of us carry two cell phones when we are outside of the country because of the difference in rates between carriers. It can be extremely convenient and often necessary when you travel but there are certain options, rules, and technical issues that you need to know in order to make it work properly, especially when you are overseas. This is a feature that is available for landline, cellular, and VoIP carriers to transfer calls from one phone number to another.

When I arrived in Tallinn, Estonia (the home of Skype) last week I needed to reroute my cell number to a different phone, so I activated call forwarding.

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