I've been using dual sim phones for several years, would never go back to a single sim phone now. You may find the two sim slots use two different size sim cards, more so the newer phones.
You can have two different network providers if you like, both sim cards are active at the same time, you can even have one on contract and one PAYG. Normally dual sim phones have sim slot one as 4G and slot two 3g, data is best used in sim slot one, the older dual sim phones are 3g and 2g.
The only drawback running two sim cards in one phone when both are active is battery drain, but I have never found this a problem. You can still use just one sim in a dual sim phone, just put the sim card in slot one for best results.
Last edited by Dallas; 15th December 2018 at 19:43..
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