Opis 60s/PushMeFon mobile network operator considerations

General considerations

The Opis 60s/PushMeFon mobiles currently (as of 2019) use quad-band 2G network technology. This means that they can operate on any 2G network worldwide. However, in some countries some network operators have discontinued 2G service.

There are currently two further network technologies in operation around the world: 3G and 4G (the latter also known as LTE). We are not contemplating a switch to 3G technology as in many cases network operators tend to view it as a stopgap technology between 2G and 4G (LTE) and 3G service will be switched off before or at least at the same time as 2G service in most of the countries affected.

We are in the process of developing a 4G (LTE) telephony platform for our products. The problems with a direct switch to this technology are that while the 4G network has been available worldwide for some time, there are significant differences from region to region. In particular no agreement could be found on a solution that allows one LTE device to participate in voice communication everywhere in the world. The voice call technology for 4G (LTE) is called Voice over LTE (or VoLTE for short), and, sadly, it hasn't been standardised, which means that several different implementations need to be used at the same time in order to allow global 4G (LTE) technology voice coverage. In addition 4G also needs to work on more than 70 frequency bands compared to 4 frequency bands for 2G. The combination of these factors has meant that 4G phones were either restricted to one global region or very expensive. It is only starting in the second half of 2019 that affordable 4G VoLTE technology ICs will be available on which we can base our mobile telephony platform in the future.

In summary, currently our quad-band 2G network still offers the best option for cost-effective coverage in most countries, but we are actively developing 4G (LTE) and Voice over LTE devices and will switch over to the technology once this becomes viable. We expect this to be the case towards the end of 2020 / beginning of 2021.

Specific Country Information

Valid as of Jul 2019 to the best of our knowlegde (please also see: https://en.wikipedia.org/wiki/2G)

(If in doubt, please ask your network provider if they can provide a SIM-card for 2G. We can assume no responsibility for the correctness of this information.)

Australia

Compatible 2G networks include: Telstra (Christmas Islands only)

Canada

There are no compatible 2G networks.

India

All except JIO/Reliance. (Airtel is pondering the future of 2G).

Japan

There are no compatible 2G networks.

Mexico

All. (Movista and AT&T will shut down their 2G networks by 2020.)

Netherlands

All network operators are 2G capable (T-Mobile and Tele 2 - which uses T-Mobile's network are considering a shutdown in 2020)

New Zealand

Compatible 2G networks include: Vodafone

Singapore

There are no compatible 2G networks.

South Korea

There are no compatible 2G networks.

Switzerland

Compatible networks include: Swisscom (considering a shutdown by 1.1.2021), Sunrise&Salt (shutdown plans?)

Taiwan

There are no compatible 2G networks.

Thailand

Compatible 2G networks include: AIS, TrueMove H, Dtac (all of them plan a shutdown by then end of 2019).

Trinidad and Tobago

Digicel, Flow.

UK

Compatible with all networks, except iD Mobile.

USA

Compatible 2G networks include: T-Mobile, Cellular Abroad, CTExcel, Jaguar Mobile, KidsConnect, Liberty Wireless, LycaMobile, MetroPCS, Mobal, NTT DoCoMo USA, Simple Mobile, Ultra Mobile, Univision Mobile, UppWireless, US Mobile, UVA Mobile, Value Wireless, Walmart Family Mobile, ZIP SIM, and others. (Shutdown of these networks may be planned for 2020.)

All other countries

Service should be available via the mainstream network operators. (Some speciality network operators - notably 3/Three - may surcharge for use of a 2G service or block it. It is best either to avoid them or to find out the exact conditions beforehand.)