Has anyone had experience in how to be able to switch between two different cellular providers on a Tieline i-Mix G3 easily (for not-so-bright talent/ sports guy)? We intend to buy one of their USB modules for the Tieline, but we would like to also have VZ and ATT USB modems to pick which service is going to work right that day... With Comrex's product it's very easy. Not so much with the Tieline it seems....