My D2G is also giving similar problem

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I have an unlocked D2G. in Global mode. ( Android 2.3.4)
Mine started a similar issue.

No voice in either direction.
Happens intermittently.
No difference lo land lines or mobiles.

Yet Skype and data works fine.

I use on the Dialog network in Sri Lanka. ( GSM 3G network )

mine started to do the same,i downgraded,upgraded, tried tbh unlock,custom roms,but nothing works. funny is that i have silence on outgoing call on 2g network,incoming calls are fine.on 3g network works ok,but signal is awfull(t-mobile,CRO).
This and wifi on/off problem turned my d2g into piece of cr*p,wondering if any new OTA update comes ,it will bring function that phone cannot power from power button or such.
FU motorola

edit: seems ther is much flame on this issue https://community.verizonwireless.co...art=0&tstart=0

Solution for DTMF over GSM

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OK, so i was trying many things and then suddenly found a solution for DTMF dialing. If you are using the GMS of D2G, just set your phone to GSM only and also use 2G. Some how on 3G it can't dial the dtmf. Try it and let me know. I am able to call the ATT conference number in 2G.
Maybe someone should look at how the calls are being made on both frequency and have a fix.
Thanks all