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Those prepaid SIM cards from the 7-Eleven

Moderator: Mick

Those prepaid SIM cards from the 7-Eleven

Postby rowland » 22 Nov 2015, 19:17

Chunghua Telecom, good for a few months. Are they CDMA or GSM? Google is not helpful. Different pages give different answers.

Replies from people who have solid information only. Thanks.
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Re: Those prepaid SIM cards from the 7-Eleven

Postby Dog's_Breakfast » 22 Dec 2015, 18:07

rowland wrote:Chunghua Telecom, good for a few months. Are they CDMA or GSM? Google is not helpful. Different pages give different answers.

Replies from people who have solid information only. Thanks.


Not exactly sure what you're asking. The pre-paid SIM cards from 7-Eleven are for the 7-Mobile Network, not Сhunghwa Telecom. But 7-Eleven does sell recharge cards for all the other major networks (ie Сhunghwa Telecom, Taiwan Mobile, FarEasTone) - if you buy one of those, you do have to tell them which network you are using.

All SIM cards issued in Taiwan are GSM 900/1800 MHz for the 2G network, and WCDMA 2100 MHz for the 3G network. I don't know anything about the 4G network. Don't confuse CDMA with WCDMA - the latter is a 3G standard, the former is for 2G and was never used in Taiwan. If you bring an ancient 2G cell phone from the USA to Taiwan, it has to be GSM (not CDMA) and support the 900/1800 MHz bands (note that USA uses 850/1900 MHz for GSM, so you'd need a quad-band phone). Aside from all that, the USA is famous for having "locked phones" which only work with a particular carrier (ie Verizon, AT&T, Sprint, etc) - if it's locked, you can't just pop in a Сhunghwa Telecom SIM card and starting using it in Taiwan.
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Re: Those prepaid SIM cards from the 7-Eleven

Postby ironlady » 22 Dec 2015, 21:12

You can have the carrier unlock a formerly locked phone in the US if you've had it for more than a certain period of time. I can put any SIM into my iPhone at this point and have it work. The carriers don't really promote this but they will do it if you qualify and ask them to.
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