No, I didn’t do anything to set it up.
I have just solder some wires from to the corresponding SIM contacts. If you are seeing two voltage spikes and then you don’t see anything that could mean that the negotiation at 1.8V has failed.
ETSI TS 102 221 describes the procedure for switching (and thus finding the appropriate) supply voltage in section 6.2:
6.2 Supply voltage switching
The terminal shall initially activate the UICC with the lowest voltage class available. If no ATR is received, the UICC shall be deactivated and activated with the next higher class, if supported by the terminal. If an ATR is received at the first applied voltage class, the contents of the ATR shall be analysed by the terminal. If the operating class used by the terminal is not supported by the UICC, the terminal shall deactivate the UICC and activate it with a supply voltage class indicated by the UICC. If the ATR is corrupted, the terminal shall perform the procedure at least 3 times using the same operating class before rejecting the UICC. In case of 3 consecutive corrupted ATRs, the terminal may activate the UICC with the next higher class. The terminal is restricted not to use but the next higher class in the retrial attempt in this case.
And the HL7800 only supports only1.8V sim
The USIM1 interface allows control of an only 1.8V USIM and is fully compliant with GSM 11.11 recommendations concerning USIM functions.
So my guess is something is wrong in the connection. My current connections(that I have manually soldered) from the hl7800 directly to the sim card is:
UIM1_VCC --> SIM CARD C1
UIM1_CLK --> SIM CARD C3
UIM1_DATA --> SIM CARD C7
UIM1_RESET–> SIM CARD C2
So maybe there is something wrong in your connection IO/CLK or RESET connections. The problem I had is that the library of the sim card holder I made in Altium had the wrong pin numbering.
Also you could check using AT+KSIMDET and at+ksimsel your selection. I found this newer AT reference guide somewhere in the forum.
AirPrime - HL78xx - AT Commands Interface Guide - Rev8.1.pdf (1.9 MB)
Hope that helps!