'Connection problem or invalid MMI code' indicates problem with the network (i.e poor signal) or wrong MMI code have being entered by the user. Otherwise, if user is trying to recharge through the mobile which has two active sim connections. Then, there is a chance for this error.
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Restoration of data accidentally deleted from
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Clip the SIM card into the tray from the side with word UP. Insert the SIM tray with the word UP facing the display side. Press the center of the Volume buttons/SIM tray until it clicks into place.