My DTAC SIM would always connect to a local partner network back in the UK. This time it connects sometimes for a minute and then drops. I've tried it in different locations. Anyone else had this experience?

I don't need it all the time but sometimes I do need an OTP.

On 7/16/2026 at 1:06 AM, damole said:

My DTAC SIM would always connect to a local partner network back in the UK. This time it connects sometimes for a minute and then drops. I've tried it in different locations. Anyone else had this experience?

I don't need it all the time but sometimes I do need an OTP.

I have been having a similar problem with 'Mytello'. The caller answers, a few words spoken and the connection drops. It cannot then be re-established for almost an hour. Have tried to contact Mytello, but that is difficult also.

On 7/16/2026 at 1:06 AM, damole said:

My DTAC SIM would always connect to a local partner network back in the UK. This time it connects sometimes for a minute and then drops. I've tried it in different locations. Anyone else had this experience?

I don't need it all the time but sometimes I do need an OTP.

I had the same problem with the True network....Dtac is now under True....my only solution was to ditch it and switch/port my number over to AIS...never a problem since.

On 7/15/2026 at 7:06 PM, damole said:

My DTAC SIM would always connect to a local partner network back in the UK. This time it connects sometimes for a minute and then drops. I've tried it in different locations. Anyone else had this experience?

Yes, had the same experience with DTAC for the last couple of months. Would be interested to hear the reason if anyone knows..

Go into the sim card settings on the phone and switch from auto select carrier to manually select.

Then look up who DTAC / True use in the UK and chose that network.

6 hours ago, KhunHeineken said:

Go into the sim card settings on the phone and switch from auto select carrier to manually select.

Then look up who DTAC / True use in the UK and chose that network.

Won't connect to any UK network.

Maybe a longshot but the UK has closed down 3G networks (which may have had an impact on 2G also). So if your device is old it could be this.

May also be worth trying to turn roaming off and on again, these are the USSD codes for DTAC:

Turn On International Roaming (IR)

• Dial *118*9# and press call

Turn Off International Roaming (IR)

• Dial *118*2*9# and press call

14 hours ago, roquefort said:

Won't connect to any UK network.

Maybe DTAC has taken you off global roaming. Might need it reinstated.

Suggest you call the free of charge number for assistance (below).

For 24/7 global roaming emergency assistance while outside Thailand, call the dtac Call Center at +662 202 8100. This call is free of charge when made from your active dtac

8 hours ago, Roy111 said:

Maybe a longshot but the UK has closed down 3G networks (which may have had an impact on 2G also). So if your device is old it could be this.

May also be worth trying to turn roaming off and on again, these are the USSD codes for DTAC:

Turn On International Roaming (IR)

• Dial *118*9# and press call

Turn Off International Roaming (IR)

• Dial *118*2*9# and press call

Good point.

Perhaps try the sim card in a different phone.

Thanks everyone for confirming it's just not me. I've had this DTAC number almost 24 years.

I just tried to manually select to Vodafone 4G and I am now connected..

Edited July 21Jul 21 by damole
new info