Just gone thru this with my neighbours ALDI based Bauhn phone 2, it is also Dual Sim 3G & 2G (the second sim slot will only do 2G if the 1st one is using 3G), & it is working fine without the 2G network as all ALDI sims do 3G anyway. He only uses one sim.
Quite frankly I'm surprised the phone has lasted as long as it has, it throws some tantrums every now & again. We found the best way to sort it out is remove the battery wait 30 seconds & put it back in then it's good to go for another month or so.
The phone he has is not capable of 4G, so to do 4G he would need a new phone. He doesn't care; he just wants to make phone calls & at the moment the phone is still doing that.
You maybe able to put another carriers sim in the phone & have it work just fine. I don't think they are network locked, ALDI use the Telstra network so a Telstra sim will likely work.
If it's working on the 3G network you won't need to replace it soon, the 3G network is around for a fair bit longer & available anywhere you could get 4G anyway & a few more places that don't do 4G yet.
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