Careful not to get flagged changing country IP on same computer to verify Twitter they're quick to flag and the fact you only have phone verify as your option shows you're already on their radar.
Use Google voice, verify twitter with the number, change the GV number by selecting change number, pick new number, enter into New twitter, verify, then change GV number, etc. etc.
Have you tried putting your phone location as cayman islands? I've heard if you do that they don't require phone verification.
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