I make alot of calls to Djbouti whilst roaming, if I use my roaming sim to call Djbouti directly I can pay anything up to $2 per minute. However if i do the following its cheaper because its cheaper to call england than it it to call Djbouti even if you add call forwarding costs:
1) Roaming in Japan need to call Djbouti this is what i want to do
2) Forward my isle of man sim to djbouti, unconditionally & switch it off
3) Use a Japanese phone to call my isle of man number & it rings in Djbouti
Result is I pay 10c to call my isle of man sim + 27c my sim charges to forward my call to Djbouti total cost of call = 37c/min
If I dial directly from my sim to Djbouti whilst in Japan I pay $2 + per minute
Long winded but what else can a poor man do?