search for: gsm850_egsm_dcs_pcs_mode

Is anybody intimately familiar with the OpenVox G400P card, or the Quectel M20 RF modules fitted to it? I am having a strange network connectivity issue with just such a card, as follows: The card was previously used with four O2 SIMs, and -- once I mastered creating message PDUs! -- worked beautifully, save for the fact that O2's definition of "unlimited" as in text messages