Can someone give me information on UMTS and dual sim card adapter. Please suggest   me a dual sim adapter working with UMTS system?

Universal Mobile Telecommunications System ok wich system you going two used ? ...... all here are digial here with GSM and 3G here

most phone you can get any adapter that you can switch your sim

jurdy

We’ve tried a few sim adapters and some dual-sim phones, and we have to say that both solutions fail, specially the first one. Some telco companies offer having two numbers in the same sim, this is the best option.