In this section you will learn about the numerous ways a mobile phone can be used while abroad.
The most common and simplest way of using a cellphone while traveling is called roaming. When using roaming, you keep your same phone number as you do at home and pay on the same bill at home. This however is normally the most expansive way to use a cellphone while traveling. You also do not need an unlocked phone to use your phone this way.
Another way of keeping in touch while traveling is to simply use a local mobile phone provider in the country you are visiting. This is useful if you plan on spending more than a few days in the same place and need a phone number. It has a higher one time fee (depends where you are, but around 10-20 dollars including some credit) but costs a lot less than roaming if you use your phone for more than a couple minutes. You get a new phone number which is local for that country but you need an unlocked GSM phone that works on the frequency in the countries you are visiting.
The cheapest way but least convenient way is to use Skype.
If you are visiting a remote place and there is no cell phone coverage, you will need to use a satellite phone if you require a phone. This are very expansive to rent and use, but are the only solution at times when visiting a remote location.