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Reviews around signal (5.00 of 5)
The Greatest China 30-Day Data SIM
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Signal was always good in Xi'an, Wuhan, Jingzhou, 4 day cruise on Yangtsé river, Chongqing, Shangai, Guilin, Guangzhou, Zhuhai, Macao and Hong-Kong
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traveled back and forth between Taiwan and mainland a few times with no issues whatsoever - in a few cases, I actually got a better signal than people who had local phone service
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