How do I get two sims working correctly in Lumia 640 xl dual sim model please?

Terry Whiffen

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Jun 5, 2015
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New phone, two new sims (from Three, who support 3g only, not 2g).
Bothsims work, but not at the same time. When I tell it to use sim1 for data, then sim1 is also useable for everything else, sim2 shows 'no service'. Also vice verso, when sim2 is set for data use, sim1 has no service.

UPDATE: When I remove one of the Three sims, and replace it with an EE sim, BOTH of the sims then work - so maybe the problem is Three related???
 
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