How do sim4travel, maxroam etc. work technically?

PhotoJim · 14-04-2008, 16:04

My guess (and it is just a guess) is that the revenue to the provider for the inbound call exceeds the cost for the roaming for that call in some countries, and those are the countries where inbound calls are provided for free. For example (and again, hypothetical only) they might receive 10 eurocents for the inbound call and pay 7 or 8 eurocents for the roaming charge.

These providers would not risk losing money on inbound calls because certain users will find and exploit these opportunities (it's known as arbitrage), and that would make the whole business model vulnerable to collapse.

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PhotoJim (Offline) Senior Member Prepaid Expert Posts: 389 Join Date: 10 Dec 2006 Location: Regina, SK, CA Country:	14-04-2008, 16:04 My guess (and it is just a guess) is that the revenue to the provider for the inbound call exceeds the cost for the roaming for that call in some countries, and those are the countries where inbound calls are provided for free. For example (and again, hypothetical only) they might receive 10 eurocents for the inbound call and pay 7 or 8 eurocents for the roaming charge. These providers would not risk losing money on inbound calls because certain users will find and exploit these opportunities (it's known as arbitrage), and that would make the whole business model vulnerable to collapse. CA: SaskTel, Wind postpaid; Rogers, Bell postpaid iPad flex plans; US: T-Mobile postpaid data, prepaid voice; PureTalk (AT&T MVNO) prepaid voice/data; AT&T prepaid iPad plan Hardware: Too much but notably iPhone 5, iPad Mini Retina LTE, Moto G LTE (N.A. version), iPhone 4. All unlocked.