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22-11-2012, 11:47
Did you use the correct international prefix? If your US number was 212 1234567 you would need to send the text to +12121234567 or 0012121234567.
In any case the fact that texts from TIM subscribers potentially are not being delivered to your US provider does not necessarily mean that you can't send a text from your TIM SIM back to its home network while roaming.
Anyway, topup codes are usually submitted by USSD (those codes with * and # at the beginning and end), which by the way I suspect your Mifi doesn't support.
terminals: Samsung: Galaxy S5 DuoS (G900FD); BLU: Win HD LTE; Nokia: 1200; Asus: Fonepad 7 ME372CG; Huawei data: E3372, Vodafone R201, K3765, E1762;
postpaid: O2 on Business XL; prepaid: DE: Aldi Talk, Lidl; UK: 3; BG: MTel, vivacom; RU: MTS; RS: MTS; UAE: du Tourist SIM; INT'L: toggle mobile
VoIP: sipgate.de (German DID); sipgate.co.uk (British DID); ukddi.com (British DID); sipcall.ch (Swiss DID); megafon.bg (Bulgarian DID); InterVoip.com
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