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Android Guide

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#1 Oleg Nikolajev

Oleg Nikolajev


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Posted 03 June 2015 - 10:52 AM

Registration and login

Registration is a straight-forward procedure. After downloading and installing the app from Google Play proceed with our greetings screens.

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Then select your home country and enter your home number. This is number will be used to identify you as a user and later will be referred as “home” or “main” number.

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An SMS will be sent to this number with 4-digit code which will be used to validate you. If SMS doesn’t come, then you can request the code via callback (corresponding button will be shown after 2 minutes).


After validating your number with the code you are set to go!





To allow Roamer handle your incoming calls, you should turn on “Receive calls”. To do this, you will need to setup forwarding to our local service number.


Automatic  setup - the “easy” way

In the side menu tap on “Receive calls”, tap on the switch and select “AUTO”. This will automatically setup the forwarding and then check if forwarding really is active.

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Manual setup - the “hard” way

In the side menu tap on “Receive calls”, tap on the switch and select “Manual”

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An instruction screen will be presented to you. You will need to set the unconditional forwarding to the given number.



You can do that with ussd command (**21*PHONE_NUMBER#, e.g. **21*+37125443896#), via operator’s app (if you have any), or by calling your operator’s support line. After doing so press on “Confirm” to check if forwarding works. If it does, you will see that “Receive calls” switch is now active.


After activating “Receive calls”, all calls will be handled by Roamer. Incoming calls over internet are free.



Linking local SIM

Linking local SIM is not mandatory, since you can use Wi-Fi hotspots to receive and make calls, you must keep in mind that sometimes there are no available Wi-Fi connections nearby, or public Wi-Fi networks has a bad latency, or VoIP traffic get’s blocked.


Just to play safe, we recommend you to get a local SIM. Main reasons to do that:

  1. Economy - buying local SIM may save you your money if you’re going to stay for while in abroad country and allow you to be fully connected with your family, friends and coworkers.

  2. Reliability - local SIMs usually provide 3G/4G internet access. This eliminates several problems which may occur by using public Wi-Fi hotspots (closed ports, high latency, blocked VoIP traffic and etc).  In addition to that, you will be able to make regular calls that uses GSM/CDMA cellular networks.


Keep in mind that you can link local SIM only abroad. Linking local SIM in home country could trigger unwanted roaming charges.


Insert local SIM in your phone. Make sure that SIM is active (you are able to receive calls and SMS). Select “Local SIM” icon in sidemenu and then tap on "Local SIM" switch.

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Enter your local number and validate it with 4-digit code which you received by SMS.

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If SMS doesn’t come, then you can request the code via callback (corresponding button will be shown after 2 minutes).



Making calls and changing your caller’s ID

There will are 3 types of calls available to you: regular, internet and free call.



• Free calls (Wi-Fi/3G/4G) - those are actually Internet calls between Roamer users. You don't pay anything! Both users need to have their numbers registered in Roamer and both have to have Internet coverage on the moment of call.


• Internet calls (Wi-Fi/3G/4G) - cheaper, since users don't need to pay for the callback call and only requires the Internet connection.


• Regular (GSM) calls - more reliable, since there is no need to have a constant internet connection. Connection is only required to initiate a callback (couple of KBs of data). Even if you don't have an Internet connection - don't worry! Roamer will use a smart call-through system and will initiate a call in a different way - without the internet (takes more time). To select the type of call simply navigate to our dial pad tab (rightmost one) and use the switch or choose a contact from your contact book (there will be a button for each type of call).


In addition to that, our users are free to set change their caller ID as they like. Three caller IDs are available for you to choice: your home number, your local number and “hidden” number. Local number caller ID is available to you only after linking local SIM.


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